XML 113 R105.htm IDEA: XBRL DOCUMENT
v3.22.1

Pension and Postretirement Benefit Plans - Pension Asset Fair Values (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) standardPlan country | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Qualified and Non-Pension Benefits |  |  |
Benefit Plan Information |  |  |
Company-sponsored retirement plans, number of countries | country | 28 |  |
Qualified and Non-Pension Benefits | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | $ 16,953 | $ 17,127 | $ 16,099
Qualified and Non-Pension Benefits | International |  |  |
Benefit Plan Information |  |  |
Company-sponsored retirement plans, minimum number of international plans | standardPlan | 70 |  |
Company-sponsored retirement plans, number of countries | country | 25 |  |
Qualified and Non-Pension Benefits | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | $ 8,016 | 8,194 | 6,923
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 17,169 | 17,490 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,849 | 5,525 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6,543 | 6,572 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 8,138 | 8,351 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,031 | 1,675 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,753 | 4,833 |
Qualified and Non-Pension Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 534 | 586 |
Qualified and Non-Pension Benefits | Global equity | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3,744 | 4,556 |
Qualified and Non-Pension Benefits | Global equity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3,340 | 4,123 |
Qualified and Non-Pension Benefits | Global equity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Global equity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Global equity | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,500 | 2,034 |
Qualified and Non-Pension Benefits | Global equity | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 750 | 1,252 |
Qualified and Non-Pension Benefits | Global equity | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 743 | 704 |
Qualified and Non-Pension Benefits | Global equity | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 5 | 4 |
Qualified and Non-Pension Benefits | Global equity | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2 | 74 |
Qualified and Non-Pension Benefits | U.S. equities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,875 | 2,082 |
Qualified and Non-Pension Benefits | U.S. equities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | U.S. equities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | U.S. equities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,875 | 2,082 |
Qualified and Non-Pension Benefits | Non-U.S. equities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,465 | 2,041 |
Qualified and Non-Pension Benefits | Non-U.S. equities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. equities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. equities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,465 | 2,041 |
Qualified and Non-Pension Benefits | Growth equities | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 315 | 547 |
Qualified and Non-Pension Benefits | Growth equities | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 181 | 209 |
Qualified and Non-Pension Benefits | Growth equities | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Growth equities | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 496 | 756 |
Qualified and Non-Pension Benefits | Value equities | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 328 | 659 |
Qualified and Non-Pension Benefits | Value equities | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 15 | 396 |
Qualified and Non-Pension Benefits | Value equities | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Value equities | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 343 | 1,055 |
Qualified and Non-Pension Benefits | Core equities | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 107 | 46 |
Qualified and Non-Pension Benefits | Core equities | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 547 | 99 |
Qualified and Non-Pension Benefits | Core equities | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 5 | 4 |
Qualified and Non-Pension Benefits | Core equities | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 659 | 149 |
Qualified and Non-Pension Benefits | Index And Longshort Equity | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 404 | 433 |
Qualified and Non-Pension Benefits | Fixed income | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7,939 | 7,810 |
Qualified and Non-Pension Benefits | Fixed income | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,439 | 1,307 |
Qualified and Non-Pension Benefits | Fixed income | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6,368 | 6,432 |
Qualified and Non-Pension Benefits | Fixed income | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Fixed income | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,920 | 4,708 |
Qualified and Non-Pension Benefits | Fixed income | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 127 | 138 |
Qualified and Non-Pension Benefits | Fixed income | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3,886 | 3,991 |
Qualified and Non-Pension Benefits | Fixed income | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 14 | 16 |
Qualified and Non-Pension Benefits | Fixed income | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 893 | 563 |
Qualified and Non-Pension Benefits | U.S. government securities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,417 | 1,301 |
Qualified and Non-Pension Benefits | U.S. government securities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 716 | 978 |
Qualified and Non-Pension Benefits | U.S. government securities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | U.S. government securities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,133 | 2,279 |
Qualified and Non-Pension Benefits | Domestic government debt | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 73 | 71 |
Qualified and Non-Pension Benefits | Domestic government debt | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,039 | 1,045 |
Qualified and Non-Pension Benefits | Domestic government debt | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4 | 5 |
Qualified and Non-Pension Benefits | Domestic government debt | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,116 | 1,121 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 89 | 71 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 89 | 71 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 22 | 33 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 458 | 476 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. government securities | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 480 | 509 |
Qualified and Non-Pension Benefits | Preferred and convertible securities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Preferred and convertible securities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 54 | 55 |
Qualified and Non-Pension Benefits | Preferred and convertible securities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Preferred and convertible securities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 54 | 55 |
Qualified and Non-Pension Benefits | U.S. corporate bonds | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 11 | 10 |
Qualified and Non-Pension Benefits | U.S. corporate bonds | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,620 | 4,501 |
Qualified and Non-Pension Benefits | U.S. corporate bonds | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | U.S. corporate bonds | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 4,631 | 4,511 |
Qualified and Non-Pension Benefits | Non-U.S. corporate bonds | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. corporate bonds | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 883 | 820 |
Qualified and Non-Pension Benefits | Non-U.S. corporate bonds | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Non-U.S. corporate bonds | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 883 | 820 |
Qualified and Non-Pension Benefits | Corporate debt securities | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 32 | 34 |
Qualified and Non-Pension Benefits | Corporate debt securities | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,389 | 2,470 |
Qualified and Non-Pension Benefits | Corporate debt securities | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 10 | 11 |
Qualified and Non-Pension Benefits | Corporate debt securities | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,431 | 2,515 |
Qualified and Non-Pension Benefits | Derivative instruments | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 11 | (4) |
Qualified and Non-Pension Benefits | Derivative instruments | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6 | 7 |
Qualified and Non-Pension Benefits | Derivative instruments | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Derivative instruments | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 17 | 3 |
Qualified and Non-Pension Benefits | Other | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 132 | 71 |
Qualified and Non-Pension Benefits | Total Private Equity | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,061 | 1,871 |
Qualified and Non-Pension Benefits | Total Private Equity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 58 | 70 |
Qualified and Non-Pension Benefits | Total Private Equity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Total Private Equity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Total Private Equity | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 454 | 427 |
Qualified and Non-Pension Benefits | Total Private Equity | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2 | 128 |
Qualified and Non-Pension Benefits | Total Private Equity | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 58 | 86 |
Qualified and Non-Pension Benefits | Total Private Equity | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 5 | 5 |
Qualified and Non-Pension Benefits | Growth equity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 58 | 70 |
Qualified and Non-Pension Benefits | Growth equity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Growth equity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Growth equity | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 58 | 70 |
Qualified and Non-Pension Benefits | Real estate | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2 | 128 |
Qualified and Non-Pension Benefits | Real estate | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 58 | 86 |
Qualified and Non-Pension Benefits | Real estate | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 5 | 5 |
Qualified and Non-Pension Benefits | Real estate | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 163 | 92 |
Qualified and Non-Pension Benefits | Real estate | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 65 | 219 |
Qualified and Non-Pension Benefits | Partnership Investments | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,003 | 1,801 |
Qualified and Non-Pension Benefits | Partnership Investments | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 226 | 116 |
Qualified and Non-Pension Benefits | Total Absolute Return | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 2,727 | 2,747 |
Qualified and Non-Pension Benefits | Total Absolute Return | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 0 |
Qualified and Non-Pension Benefits | Total Absolute Return | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 166 | 134 |
Qualified and Non-Pension Benefits | Total Absolute Return | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Total Absolute Return | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,072 | 981 |
Qualified and Non-Pension Benefits | Total Absolute Return | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7 | 8 |
Qualified and Non-Pension Benefits | Total Absolute Return | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 1 |
Qualified and Non-Pension Benefits | Total Absolute Return | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 510 | 561 |
Qualified and Non-Pension Benefits | Derivatives - absolute return | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Derivatives - absolute return | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 1 |
Qualified and Non-Pension Benefits | Derivatives - absolute return | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Derivatives - absolute return | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 1 |
Qualified and Non-Pension Benefits | Insurance | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Insurance | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Insurance | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 504 | 555 |
Qualified and Non-Pension Benefits | Insurance | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 504 | 555 |
Qualified and Non-Pension Benefits | Fixed income and other | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 0 |
Qualified and Non-Pension Benefits | Fixed income and other | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 166 | 134 |
Qualified and Non-Pension Benefits | Fixed income and other | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Fixed income and other | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 167 | 134 |
Qualified and Non-Pension Benefits | Hedge fund/fund of funds | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,943 | 2,046 |
Qualified and Non-Pension Benefits | Partnership investments | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 617 | 567 |
Qualified and Non-Pension Benefits | Other | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7 | 8 |
Qualified and Non-Pension Benefits | Other | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Other | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 6 | 6 |
Qualified and Non-Pension Benefits | Other | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 1 |
Qualified and Non-Pension Benefits | Other | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 13 | 14 |
Qualified and Non-Pension Benefits | Hedge funds | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 535 | 410 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 698 | 506 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 11 | 25 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 9 | 6 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 192 | 201 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 145 | 149 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 46 | 51 |
Qualified and Non-Pension Benefits | Total Cash and Cash Equivalents | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 11 | 25 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 9 | 12 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 678 | 475 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 37 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | International | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 145 | 149 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | International | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 46 | 51 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | International | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | International | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 1 |
Qualified and Non-Pension Benefits | Cash and cash equivalents | International | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 191 | 200 |
Qualified and Non-Pension Benefits | Repurchase agreements and derivative margin activity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Repurchase agreements and derivative margin activity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | (6) |
Qualified and Non-Pension Benefits | Repurchase agreements and derivative margin activity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Qualified and Non-Pension Benefits | Repurchase agreements and derivative margin activity | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | (6) |
Qualified and Non-Pension Benefits | Other items to reconcile to fair value of plan assets | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | (216) | (363) |
Qualified and Non-Pension Benefits | Other items to reconcile to fair value of plan assets | International | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | $ (122) | (157) |
Postretirement Benefits | Funded |  |  |
Benefit Plan Information |  |  |
Percentage of plan assets within 401h account | 65.00% |  |
Fair value of plan assets | $ 1,353 | 1,376 | $ 1,338
Postretirement Benefits | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,353 | 1,376 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1,363 | 1,401 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 505 | 574 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 546 | 547 |
Postretirement Benefits | Defined Benefit Plan Assets, Excluding Reconciling Items | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Global equity | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 400 | 481 |
Postretirement Benefits | Global equity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 372 | 450 |
Postretirement Benefits | Global equity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Global equity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | U.S. equities | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 292 | 347 |
Postretirement Benefits | U.S. equities | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | U.S. equities | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | U.S. equities | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 292 | 347 |
Postretirement Benefits | Non-U.S. equities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 80 | 103 |
Postretirement Benefits | Non-U.S. equities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Non-U.S. equities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Non-U.S. equities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 80 | 103 |
Postretirement Benefits | Index And Longshort Equity | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 28 | 31 |
Postretirement Benefits | Fixed income | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 654 | 638 |
Postretirement Benefits | Fixed income | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 110 | 96 |
Postretirement Benefits | Fixed income | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 537 | 539 |
Postretirement Benefits | Fixed income | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | U.S. government securities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 109 | 95 |
Postretirement Benefits | U.S. government securities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 180 | 214 |
Postretirement Benefits | U.S. government securities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | U.S. government securities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 289 | 309 |
Postretirement Benefits | Non-U.S. government securities | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Non-U.S. government securities | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7 | 6 |
Postretirement Benefits | Non-U.S. government securities | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Non-U.S. government securities | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7 | 6 |
Postretirement Benefits | U.S. corporate bonds | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 1 | 1 |
Postretirement Benefits | U.S. corporate bonds | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 291 | 267 |
Postretirement Benefits | U.S. corporate bonds | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | U.S. corporate bonds | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 292 | 268 |
Postretirement Benefits | Non-U.S. corporate bonds | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Non-U.S. corporate bonds | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 59 | 52 |
Postretirement Benefits | Non-U.S. corporate bonds | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Non-U.S. corporate bonds | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 59 | 52 |
Postretirement Benefits | Derivative instruments | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Derivative instruments | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Derivative instruments | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Derivative instruments | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Other | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 7 | 3 |
Postretirement Benefits | Total Private Equity | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 110 | 98 |
Postretirement Benefits | Total Private Equity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3 | 3 |
Postretirement Benefits | Total Private Equity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Total Private Equity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Growth equity | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3 | 3 |
Postretirement Benefits | Growth equity | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Growth equity | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Growth equity | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 3 | 3 |
Postretirement Benefits | Partnership Investments | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 107 | 95 |
Postretirement Benefits | Total Absolute Return | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 143 | 135 |
Postretirement Benefits | Total Absolute Return | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Total Absolute Return | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 9 | 7 |
Postretirement Benefits | Total Absolute Return | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Fixed income and other | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Fixed income and other | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 9 | 7 |
Postretirement Benefits | Fixed income and other | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Fixed income and other | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 9 | 7 |
Postretirement Benefits | Hedge fund/fund of funds | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 102 | 100 |
Postretirement Benefits | Partnership investments | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 32 | 28 |
Postretirement Benefits | Total Cash and Cash Equivalents | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 56 | 49 |
Postretirement Benefits | Total Cash and Cash Equivalents | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 25 |
Postretirement Benefits | Total Cash and Cash Equivalents | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 1 |
Postretirement Benefits | Total Cash and Cash Equivalents | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Cash and cash equivalents | United States | Level 1 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 25 |
Postretirement Benefits | Cash and cash equivalents | United States | Level 2 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 1 |
Postretirement Benefits | Cash and cash equivalents | United States | Level 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 0 | 0 |
Postretirement Benefits | Cash and cash equivalents | United States | Fair Value Measured at Net Asset Value Per Share | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 36 | 23 |
Postretirement Benefits | Cash and cash equivalents | United States | Levels 1, 2 and 3 | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | 20 | 26 |
Postretirement Benefits | Other items to reconcile to fair value of plan assets | United States | Funded |  |  |
Benefit Plan Information |  |  |
Fair value of plan assets | $ (10) | $ (25) |

X
- Definition The number of company-sponsored international plans aggregated together for disclosures purposes. + References No definition available. + Details
Name: | mmm_DefinedBenefitPlanNumberOfPlansMinimum
Namespace Prefix: | mmm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the number of countries in which company has company-sponsored plans. + References No definition available. + Details
Name: | mmm_NumberOfCountriesInWhichRetirementPlansSponsored
Namespace Prefix: | mmm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This represents the percentage of plan assets within a 401(h) account within the same trust as the primary U.S. pension plan. + References No definition available. + Details
Name: | mmm_PercentageOfPlanAssetsWithin401hAccount
Namespace Prefix: | mmm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanFundingStatusAxis=us-gaap_FundedPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_DefinedBenefitPlanAssetsExcludingReconcilingItemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_USEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel12And3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_NonUSEquitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_GrowthEquityPublicMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_ValueEquitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_CoreEquitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_IndexAndLongshortEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_DomesticGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_PreferredAndConvertibleSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ForeignCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_PrivateEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_GrowthEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_PartnershipInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_AbsoluteReturnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_AbsoluteReturnDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_InsuranceContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_FixedIncomeAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMultistrategyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_PartnershipInvestmentsAbsoluteReturnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_OtherAbsoluteReturnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_HedgeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_RepurchaseAgreementsAndDerivativeMarginActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mmm_DefinedBenefitPlansReconcilingItemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |