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Postretirement benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | $ 11,169 | $ 7,945 |
Cash | 1,659 | 1,747 | $ 1,537
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 119 | 120 | 152
Fair Value, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 767 | 882 |
Fair Value, Recurring [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 286 | 434 |
Fair Value, Recurring [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 481 | 438 |
Fair Value, Recurring [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 0 | 10 |
Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 51 | 60 |
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 10,108 | 6,770 |
UNITED STATES | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 3,307 | 3,108 |
Defined Benefit Plan, Plan Assets, Amount | 4,151 | 3,739 | 3,301
Cash | 127 | 14 |
UNITED STATES | Pension Plan [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 2,287 | 2,127 |
UNITED STATES | Pension Plan [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 1,019 | 981 |
UNITED STATES | Pension Plan [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 1 | 0 |
UNITED STATES | Pension Plan [Member] | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 33 | 59 |
UNITED STATES | Pension Plan [Member] | Short-term investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 33 | 59 |
UNITED STATES | Pension Plan [Member] | Short-term investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | Short-term investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 472 | 436 |
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 380 | 250 |
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 92 | 186 |
UNITED STATES | Pension Plan [Member] | US Treasury and Government [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 923 | 793 |
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 923 | 793 |
UNITED STATES | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 4 | 2 |
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 4 | 2 |
UNITED STATES | Pension Plan [Member] | States, municipalities, and political subdivisions | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 1,872 | 1,818 |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 1,871 | 1,818 |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 1 | 0 |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 3 |  |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 3 |  |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 |  |
UNITED STATES | Pension Plan [Member] | Defined Benefit Plan, Derivative | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 |  |
UNITED STATES | Other Investments [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 542 | 543 |
UNITED STATES | Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 175 | 74 |
Non - U.S. | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 1,128 | 1,129 |
Defined Benefit Plan, Plan Assets, Amount | 1,318 | 1,284 | $ 1,141
Non - U.S. | Pension Plan [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 158 | 132 |
Non - U.S. | Pension Plan [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 970 | 997 |
Non - U.S. | Pension Plan [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
Non - U.S. | Pension Plan [Member] | Short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 5 | 5 |
Non - U.S. | Pension Plan [Member] | Short-term investments | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 5 | 5 |
Non - U.S. | Pension Plan [Member] | Short-term investments | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
Non - U.S. | Pension Plan [Member] | Short-term investments | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 679 | 609 |
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 679 | 609 |
Non - U.S. | Pension Plan [Member] | Debt Security, Government, Non-US [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 444 | 515 |
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 153 | 127 |
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 291 | 388 |
Non - U.S. | Pension Plan [Member] | Defined Benefit Plan, Equity Securities [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 0 | 0 |
Non - U.S. | Other Investments [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | 175 | 147 |
Non - U.S. | Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] | Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other Investments | $ 15 | $ 8 |

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