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Retirement Benefits - Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plan |  |  |
Plan Contributions [Abstract] |  |  |
Payment for Pension and Other Postretirement Benefits | $ 773 |  |
Pension and Other Postretirement Benefit Contributions Unfunded Plans | 387 |  |
Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans | 390 |  |
Pension Plan | Minimum |  |  |
Plan Contributions [Abstract] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 600 |  |
Pension Plan | Maximum |  |  |
Plan Contributions [Abstract] |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 800 |  |
Pension Plan | U.S. Plans |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 49,020 | $ 45,672 |
Service cost | 526 | 520 | $ 474
Interest cost | 928 | 1,291 | 1,570
Amendments | 0 | 0 |
Separation programs/other | (25) | (10) |
Curtailments | 0 | 0 |
Settlements | (1,297) | (25) |
Plan participant contributions | 20 | 23 |
Benefits paid | (2,522) | (3,055) |
Foreign exchange translation | 0 | 0 |
Actuarial (gain)/loss | (1,762) | 4,604 |
Benefit obligation at December 31 | 44,888 | 49,020 | 45,672
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 48,355 | 44,253 |
Actual return on plan assets | 1,150 | 7,018 |
Company contributions | 247 | 186 |
Plan participant contributions | 20 | 23 |
Benefits paid | (2,522) | (3,055) |
Settlements | (1,297) | (25) |
Foreign exchange translation | 0 | 0 |
Defined Benefit Plan Other Increase Decrease Plan Assets | (44) | (45) |
Fair value of plan assets at December 31 | 45,909 | 48,355 | 44,253
Funded status at December 31 | 1,021 | (665) |
Amounts Recognized on the Balance Sheet |  |  |
Prepaid assets | 3,130 | 1,578 |
Accrued liabilities | (2,109) | (2,243) |
Total | 1,021 | (665) |
Amounts Recognized in Accumulated Other Comprehensive Loss (pre-tax) |  |  |
Unamortized prior service costs/(credits) | 2 | 4 |
Pension Plans in which Accumulated Benefit Obligation Exceeds Plan Assets at December 31 |  |  |
Accumulated benefit obligation | 2,192 | 2,295 |
Fair value of plan assets | 140 | 145 |
Accumulated Benefit Obligation at December 31 | 43,879 | 47,848 |
Pension Plans in which Projected Benefit Obligation Exceeds Plan Assets at December 31 |  |  |
Projected benefit obligation | 2,249 | 2,389 |
Fair value of plan assets | 140 | 145 |
Expected Future Benefit Payments and Amortization |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | 2,700 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 2,670 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 2,680 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 2,680 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 2,650 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Year Thereafter | 12,805 |  |
Pension Plan | U.S. Plans | Alternatives |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 6,337 |  |
Fair value of plan assets at December 31 | 6,690 | 6,337 |
Pension Plan | U.S. Plans | Hedge Funds |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 3,258 |  |
Fair value of plan assets at December 31 | 3,390 | 3,258 |
Pension Plan | U.S. Plans | Private Equity Funds |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 1,859 |  |
Fair value of plan assets at December 31 | 1,977 | 1,859 |
Pension Plan | Non-U.S. Plans |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 39,835 | 35,373 |
Service cost | 557 | 529 | 506
Interest cost | 420 | 514 | 691
Amendments | 4 | 0 |
Separation programs/other | 185 | 219 |
Curtailments | (4) | 0 |
Settlements | 0 | (189) |
Plan participant contributions | 13 | 14 |
Benefits paid | (1,565) | (1,394) |
Foreign exchange translation | (1,432) | 1,131 |
Actuarial (gain)/loss | (3,581) | 3,638 |
Benefit obligation at December 31 | 34,432 | 39,835 | 35,373
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 33,820 | 29,958 |
Actual return on plan assets | 788 | 4,149 |
Company contributions | 912 | 744 |
Plan participant contributions | 13 | 14 |
Benefits paid | (1,565) | (1,394) |
Settlements | 0 | (189) |
Foreign exchange translation | (855) | 547 |
Defined Benefit Plan Other Increase Decrease Plan Assets | (28) | (9) |
Fair value of plan assets at December 31 | 33,085 | 33,820 | 29,958
Funded status at December 31 | (1,347) | (6,015) |
Amounts Recognized on the Balance Sheet |  |  |
Prepaid assets | 5,404 | 2,673 |
Accrued liabilities | (6,751) | (8,688) |
Total | (1,347) | (6,015) |
Amounts Recognized in Accumulated Other Comprehensive Loss (pre-tax) |  |  |
Unamortized prior service costs/(credits) | 170 | 206 |
Pension Plans in which Accumulated Benefit Obligation Exceeds Plan Assets at December 31 |  |  |
Accumulated benefit obligation | 12,586 | 14,595 |
Fair value of plan assets | 6,835 | 7,203 |
Accumulated Benefit Obligation at December 31 | 31,850 | 36,272 |
Pension Plans in which Projected Benefit Obligation Exceeds Plan Assets at December 31 |  |  |
Projected benefit obligation | 13,651 | 15,951 |
Fair value of plan assets | 6,900 | 7,264 |
Expected Future Benefit Payments and Amortization |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | 1,490 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 1,350 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 1,360 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 1,380 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 1,380 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Year Thereafter | 7,035 |  |
Pension Plan | Non-U.S. Plans | Alternatives |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 2,311 |  |
Fair value of plan assets at December 31 | 2,363 | 2,311 |
Pension Plan | Non-U.S. Plans | Hedge Funds |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 1,259 |  |
Fair value of plan assets at December 31 | 1,221 | 1,259 |
Pension Plan | Non-U.S. Plans | Private Equity Funds |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 729 |  |
Fair value of plan assets at December 31 | 756 | 729 |
Worldwide OPEB |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 6,575 | 6,072 |
Service cost | 49 | 47 | 43
Interest cost | 127 | 169 | 211
Amendments | 0 | 21 |
Separation programs/other | 0 | 0 |
Curtailments | 0 | 0 |
Settlements | 0 | 0 |
Plan participant contributions | 21 | 21 |
Benefits paid | (356) | (339) |
Foreign exchange translation | 0 | 28 |
Actuarial (gain)/loss | (376) | 556 |
Benefit obligation at December 31 | 6,040 | 6,575 | 6,072
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Company contributions | 0 | 0 |
Plan participant contributions - Worldwide OPEB | 0 | 0 |
Benefits paid - Worldwide OPEB | 0 | 0 |
Settlements | 0 | 0 |
Foreign exchange translation | 0 | 0 |
Defined Benefit Plan Other Increase Decrease Plan Assets | 0 | 0 |
Fair value of plan assets at December 31 | 0 | 0 | $ 0
Funded status at December 31 | (6,040) | (6,575) |
Amounts Recognized on the Balance Sheet |  |  |
Prepaid assets | 0 | 0 |
Accrued liabilities | (6,040) | (6,575) |
Total | (6,040) | (6,575) |
Amounts Recognized in Accumulated Other Comprehensive Loss (pre-tax) |  |  |
Unamortized prior service costs/(credits) | 22 | $ (11) |
Expected Future Benefit Payments and Amortization |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | 335 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 330 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 330 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 330 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 330 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Year Thereafter | $ 1,620 |  |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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