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Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2021
Accounting Policies [Abstract] |
Impact on previously reported values after correction | The adoption of this change impacted previously reported amounts included herein as indicated in the tables below.
Consolidated Statement of Income |  |  |  |  |  |  |  |
|  | Three months ended September 30, 2020 |  | Nine months ended September 30, 2020
(Millions, except per share amounts) |  | Under Prior Method |  | As Adjusted |  | Under Prior Method |  | As Adjusted
Other expense (income), net |  | $ | 104 |  | $ | 83 |  | $ | 311 |  | $ | 248
Income before income taxes |  | 1,805 |  | 1,826 |  | 5,001 |  | 5,064
Provision for income taxes |  | 387 |  | 391 |  | 1,002 |  | 1,016
Income of consolidated group |  | 1,418 |  | 1,435 |  | 3,999 |  | 4,048
Net income including noncontrolling interest |  | 1,417 |  | 1,434 |  | 3,998 |  | 4,047
Net income attributable to 3M |  | 1,413 |  | 1,430 |  | 3,995 |  | 4,044
Earnings per share attributable to 3M common shareholders — basic |  | $ | 2.45 |  | $ | 2.47 |  | $ | 6.92 |  | $ | 7.01
Earnings per share attributable to 3M common shareholders — diluted |  | $ | 2.43 |  | $ | 2.45 |  | $ | 6.87 |  | $ | 6.95
Consolidated Statement of Comprehensive Income |  |  |  |  |  |  |  |
|  | Three months ended September 30, 2020 |  | Nine months ended September 30, 2020
(Millions) |  | Under Prior Method |  | As Adjusted |  | Under Prior Method |  | As Adjusted
Net income including noncontrolling interest |  | $ | 1,417 |  | $ | 1,434 |  | $ | 3,998 |  | $ | 4,047
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |
Defined benefit pension and postretirement plans adjustment |  | 127 |  | 116 |  | 304 |  | 271
Total other comprehensive income (loss), net of tax |  | 327 |  | 316 |  | 177 |  |  | 144 |
Comprehensive income (loss) including noncontrolling interest |  | 1,744 |  | 1,750 |  | 4,175 |  | 4,191
Comprehensive income (loss) attributable to 3M |  | 1,739 |  | 1,745 |  | 4,174 |  | 4,190
Consolidated Balance Sheet |  |  |  |
|  | As of December 31, 2020
(Millions) |  | Under Prior Method |  | As Adjusted
Retained earnings |  | $ | 43,761 |  | $ | 43,821
Accumulated other comprehensive income (loss) |  | (7,661) |  |  | (7,721) |
Consolidated Statement of Cash Flows |  |  |  |
|  | Nine months ended September 30, 2020
(Millions) |  | Under Prior Method |  | As Adjusted
Net income including noncontrolling interest |  | $ | 3,998 |  | $ | 4,047
Company pension and postretirement expense |  | 295 |  | 232
Other — net |  | (10) |  |  | 4 |
Earnings per share computations | The computations for basic and diluted earnings per share follow: Earnings Per Share Computations
|  | Three months ended September 30, |  | Nine months ended September 30,
(Amounts in millions, except per share amounts) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |  |
Net income attributable to 3M |  | $ | 1,434 |  |  | $ | 1,430 |  |  | $ | 4,582 |  |  | $ | 4,044 |
Denominator: |  |  |  |  |  |  |  |
Denominator for weighted average 3M common shares outstanding – basic |  | 579.6 |  |  | 577.8 |  |  | 580.3 |  |  | 577.2 |
Dilution associated with the Company’s stock-based compensation plans |  | 6.7 |  |  | 4.6 |  |  | 6.8 |  |  | 4.4 |
Denominator for weighted average 3M common shares outstanding – diluted |  | 586.3 |  |  | 582.4 |  |  | 587.1 |  |  | 581.6 |
Earnings per share attributable to 3M common shareholders – basic |  | $ | 2.47 |  |  | $ | 2.47 |  |  | $ | 7.90 |  |  | $ | 7.01 |
Earnings per share attributable to 3M common shareholders – diluted |  | $ | 2.45 |  |  | $ | 2.45 |  |  | $ | 7.81 |  |  | $ | 6.95 |

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