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Postretirement benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | $ 13,696 |  | $ 11,169 |  |
Cash | 2,012 |  | 1,659 |  | $ 1,747
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 81 |  | 119 |  | 120
Fair Value, Recurring [Member] | Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 552 | [1] | 286 | [2] |
Fair Value, Recurring [Member] | Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 399 | [1] | 481 | [2] |
Fair Value, Recurring [Member] | Level 3 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 0 | [1] | 0 | [2] |
Other Investments |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 47 |  | 51 |  |
Other Investments | Other Postretirement Benefits Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 31 |  |  |  |
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 12,355 |  | 10,108 |  |
UNITED STATES | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 2,540 | [3] | 3,307 | [4] |
Defined Benefit Plan, Plan Assets, Amount | 3,316 |  | 4,151 |  | 3,739
Cash | 5 |  | 127 |  |
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 | 1,798 | [3] | 2,287 | [4] |
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 | 742 | [3] | 1,019 | [4] |
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 | 0 | [3] | 1 | [4] |
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 | 42 |  | 33 |  |
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 | 42 |  | 33 |  |
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] | U.S. Treasury / Agency |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 541 |  | 472 |  |
UNITED STATES | Pension Plan [Member] | U.S. Treasury / Agency | Level 1 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 431 |  | 380 |  |
UNITED STATES | Pension Plan [Member] | U.S. Treasury / Agency | Level 2 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 110 |  | 92 |  |
UNITED STATES | Pension Plan [Member] | U.S. Treasury / Agency | 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 | 627 |  | 923 |  |
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 | 627 |  | 923 |  |
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 | 5 |  | 4 |  |
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 | 5 |  | 4 |  |
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 | 1,321 |  | 1,872 |  |
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 | 1,321 |  | 1,871 |  |
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 | 0 |  | 1 |  |
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 | 4 |  | 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 | 4 |  | 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 |  | 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 |  | 0 |  |
UNITED STATES | Other Investments | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 538 |  | 542 |  |
UNITED STATES | Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 233 |  | 175 |  |
Non - U.S. | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, fair value of plan assets excluding measured using NAV | 721 | [3] | 1,128 | [4] |
Defined Benefit Plan, Plan Assets, Amount | 938 |  | 1,318 |  | $ 1,284
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 | 117 | [3] | 158 | [4] |
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 | 600 | [3] | 970 | [4] |
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 | 4 | [3] | 0 | [4] |
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 | 10 |  | 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 | 10 |  | 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 | 454 |  | 679 |  |
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 | 454 |  | 679 |  |
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 | 257 |  | 444 |  |
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 | 107 |  | 153 |  |
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 | 146 |  | 291 |  |
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 | 4 |  | 0 |  |
Non - U.S. | Other Investments | Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Other Investments | 201 |  | 175 |  |
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 | $ 16 |  | $ 15 |  |
[1] | Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $12,355 million, policy loans of $343 million and other investments of $47 million at December 31, 2022 measured using NAV as a practical expedient
[2] | Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $10,108 million, policy loans of $243 million and other investments of $51 million at December 31, 2021 measured using NAV as a practical expedient.
[3] | Excluded from the table above are $538 million and $201 million of other investments related to the U.S. Plans and Non-U.S. Plans, respectively, limited partnerships of $233 million and $16 million in U.S. Plans and Non-U.S. Plans, respectively, measured using NAV as a practical expedient, and $5 million in cash and accrued income related to the U.S. Plans.
[4] | Excluded from the table above are $542 million and $175 million of other investments related to the U.S. Plans and Non-U.S. Plans, respectively, limited partnerships of $175 million and $15 million in U.S. Plans and Non-U.S. Plans, respectively, measured using NAV as a practical expedient, and $127 million in cash and accrued income related to the U.S. Plans.

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