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Pension and Postretirement Benefit Plans - Change in Benefit Obligation and Plan Assets and Amounts Recognized in Balance Sheet and AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Change in benefit obligation |  |  |  |
Settlements, curtailments, special termination benefits and other | $ 32 |  |  |
Amounts recognized in the Consolidated Balance Sheet as of Dec 31, |  |  |  |
Non-current assets |  | $ 943 | $ 630 |
Accrued benefit cost |  |  |  |
Current liabilities |  | (78) | (71) |
Non-current liabilities |  | (2,870) | (4,405) |
Postretirement Benefits |  |  |  |
Change in plan assets |  |  |  |
Company contributions |  | 3 | 3 |
Funded | Qualified and Non-Pension Benefits |  |  |  |
Change in plan assets |  |  |  |
Company contributions |  | 177 | 153 |
Funded | Postretirement Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | 2,397 | 2,242 |
Acquisitions/Transfers |  | 0 | 0 |
Service cost |  | 53 | 43 | $ 43
Interest cost |  | 43 | 62 | 82
Participant contributions |  | 0 | 0 |
Foreign exchange rate changes |  | (4) | (14) |
Plan amendments |  | 0 | 0 |
Actuarial (gain) loss |  | (89) | 176 |
Benefit payments |  | (113) | (107) |
Settlements, curtailments, special termination benefits and other |  | (6) | (5) |
Benefit obligation at end of year | 2,242 | 2,281 | 2,397 | 2,242
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 1,376 | 1,338 |
Acquisitions/Transfers |  | 0 | 0 |
Actual return on plan assets |  | 93 | 147 |
Company contributions |  | 3 | 3 |
Participant contributions |  | 0 | 0 |
Foreign exchange rate changes |  | 0 | 0 |
Benefit payments |  | (113) | (107) |
Settlements, curtailments, special termination benefits and other |  | (6) | (5) |
Fair value of plan assets at end of year | 1,338 | 1,353 | 1,376 | 1,338
Funded status at end of year |  | (928) | (1,021) |
Amounts recognized in the Consolidated Balance Sheet as of Dec 31, |  |  |  |
Non-current assets |  | 0 | 0 |
Accrued benefit cost |  |  |  |
Current liabilities |  | (5) | (4) |
Non-current liabilities |  | (923) | (1,017) |
Ending balance |  | (928) | (1,021) |
Amounts recognized in accumulated other comprehensive income as of Dec 31, |  |  |  |
Net transition obligation (asset) |  | 0 | 0 |
Net actuarial loss (gain) |  | 538 | 702 |
Prior service cost (credit) |  | (197) | (230) |
Ending balance |  | 341 | 472 |
Funded | United States | Qualified and Non-Pension Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | 19,376 | 17,935 |
Acquisitions/Transfers |  | 0 | 0 |
Service cost |  | 286 | 261 | 251
Interest cost |  | 360 | 499 | 620
Participant contributions |  | 0 | 0 |
Foreign exchange rate changes |  | 0 | 0 |
Plan amendments |  | 0 | 0 |
Actuarial (gain) loss |  | (588) | 1,785 |
Benefit payments |  | (1,330) | (1,104) |
Settlements, curtailments, special termination benefits and other | 32 | 0 | 0 |
Benefit obligation at end of year | 17,935 | 18,104 | 19,376 | 17,935
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 17,127 | 16,099 |
Acquisitions/Transfers |  | 0 | 0 |
Actual return on plan assets |  | 1,079 | 2,071 |
Company contributions |  | 77 | 61 |
Participant contributions |  | 0 | 0 |
Foreign exchange rate changes |  | 0 | 0 |
Benefit payments |  | (1,330) | (1,104) |
Settlements, curtailments, special termination benefits and other |  | 0 | 0 |
Fair value of plan assets at end of year | 16,099 | 16,953 | 17,127 | 16,099
Funded status at end of year |  | (1,151) | (2,249) |
Amounts recognized in the Consolidated Balance Sheet as of Dec 31, |  |  |  |
Non-current assets |  | 0 | 0 |
Accrued benefit cost |  |  |  |
Current liabilities |  | (59) | (52) |
Non-current liabilities |  | (1,092) | (2,197) |
Ending balance |  | (1,151) | (2,249) |
Amounts recognized in accumulated other comprehensive income as of Dec 31, |  |  |  |
Net transition obligation (asset) |  | 0 | 0 |
Net actuarial loss (gain) |  | 4,991 | 6,157 |
Prior service cost (credit) |  | (80) | (104) |
Ending balance |  | 4,911 | 6,053 |
Accumulated benefit obligation |  | 17,305 | 18,441 |
Plans with accumulated benefit obligation in excess of plan assets |  |  |  |
Accumulated benefit obligation |  | 514 | 18,441 |
Fair value of plan assets |  | 0 | 17,127 |
Plans with projected benefit obligation in excess of plan assets |  |  |  |
Projected benefit obligation |  | 18,104 | 19,376 |
Fair value of plan assets |  | 16,953 | 17,127 |
Funded | United States | Postretirement Benefits |  |  |  |
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 1,376 |  |
Fair value of plan assets at end of year |  | 1,353 | 1,376 |
Funded | International | Qualified and Non-Pension Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation at beginning of year |  | 8,770 | 7,931 |
Acquisitions/Transfers |  | 0 | 1 |
Service cost |  | 164 | 152 | 131
Interest cost |  | 98 | 117 | 156
Participant contributions |  | 10 | 9 |
Foreign exchange rate changes |  | (325) | 427 |
Plan amendments |  | 1 | 0 |
Actuarial (gain) loss |  | (433) | 464 |
Benefit payments |  | (298) | (274) |
Settlements, curtailments, special termination benefits and other |  | (45) | (57) |
Benefit obligation at end of year | 7,931 | 7,942 | 8,770 | 7,931
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 8,194 | 6,923 |
Acquisitions/Transfers |  | 0 | 0 |
Actual return on plan assets |  | 321 | 1,102 |
Company contributions |  | 100 | 92 |
Participant contributions |  | 10 | 9 |
Foreign exchange rate changes |  | (265) | 376 |
Benefit payments |  | (298) | (274) |
Settlements, curtailments, special termination benefits and other |  | (46) | (34) |
Fair value of plan assets at end of year | $ 6,923 | 8,016 | 8,194 | $ 6,923
Funded status at end of year |  | 74 | (576) |
Amounts recognized in the Consolidated Balance Sheet as of Dec 31, |  |  |  |
Non-current assets |  | 943 | 630 |
Accrued benefit cost |  |  |  |
Current liabilities |  | (14) | (15) |
Non-current liabilities |  | (855) | (1,191) |
Ending balance |  | 74 | (576) |
Amounts recognized in accumulated other comprehensive income as of Dec 31, |  |  |  |
Net transition obligation (asset) |  | 6 | 9 |
Net actuarial loss (gain) |  | 960 | 1,570 |
Prior service cost (credit) |  | 3 | (2) |
Ending balance |  | 969 | 1,577 |
Accumulated benefit obligation |  | 7,484 | 8,181 |
Plans with accumulated benefit obligation in excess of plan assets |  |  |  |
Accumulated benefit obligation |  | 2,843 | 3,119 |
Fair value of plan assets |  | 2,194 | 2,199 |
Plans with projected benefit obligation in excess of plan assets |  |  |  |
Projected benefit obligation |  | 3,204 | 3,528 |
Fair value of plan assets |  | $ 2,335 | $ 2,322 |

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- Definition Changes in the fair value of plan assets for defined benefit plans due settlements, curtailments, special termination benefits and other. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) 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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- 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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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for transition asset (obligation) 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 10A -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 3: 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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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -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 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: 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 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 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 6: 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 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: 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 + Details
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