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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Postretirement Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | $ 947 | $ 1,292 |
Actual return on plan assets | 115 | (306) |
Company contributions | 74 | 46 |
Effects of exchange rate changes | 0 | 0 |
Benefits paid | (95) | (90) |
Settlements | (2) | 0 |
Other | 6 | 5 |
Fair value of plan assets December 31 | 1,045 | 947 | $ 1,292
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 1,157 | 1,541 |
Service cost | 32 | 48 | 48
Interest cost | 63 | 46 | 45
Actuarial losses (gains) | (58) | (392) |
Benefits paid | (95) | (90) |
Effects of exchange rate changes | 1 | (1) |
Plan amendments | 0 | 0 |
Curtailments | 0 | 0 |
Termination benefits | 0 | 0 | 37
Settlements | (2) | 0 |
Other | 6 | 5 |
Benefit obligation December 31 | 1,104 | 1,157 | 1,541
Funded status December 31 | (59) | (210) |
Recognized as: |  |  |
Other Assets | 107 | 0 |
Accrued and other current liabilities | (8) | (8) |
Other Noncurrent Liabilities | (158) | (202) |
United States | Pension Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | 9,094 | 13,067 |
Actual return on plan assets | 1,077 | (3,129) |
Company contributions | 307 | 293 |
Effects of exchange rate changes | 0 | 0 |
Benefits paid | (497) | (219) |
Settlements | (177) | (918) |
Other | 0 | 0 |
Fair value of plan assets December 31 | 9,804 | 9,094 | 13,067
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 9,854 | 13,999 |
Service cost | 326 | 372 | 403
Interest cost | 526 | 457 | 404
Actuarial losses (gains) | 403 | (3,851) |
Benefits paid | (497) | (219) |
Effects of exchange rate changes | 0 | 0 |
Plan amendments | 0 | 0 |
Curtailments | 8 | 12 |
Termination benefits | 3 | 2 | 56
Settlements | (177) | (918) |
Other | 0 | 0 |
Benefit obligation December 31 | 10,446 | 9,854 | 13,999
Funded status December 31 | (642) | (760) |
Recognized as: |  |  |
Other Assets | 0 | 5 |
Accrued and other current liabilities | (49) | (59) |
Other Noncurrent Liabilities | (593) | (706) |
International | Pension Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | 8,473 | 12,195 |
Actual return on plan assets | 832 | (2,793) |
Company contributions | 249 | 155 |
Effects of exchange rate changes | 283 | (848) |
Benefits paid | (256) | (250) |
Settlements | (53) | (16) |
Other | 34 | 30 |
Fair value of plan assets December 31 | 9,562 | 8,473 | 12,195
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 7,755 | 11,575 |
Service cost | 196 | 283 | 328
Interest cost | 299 | 145 | 123
Actuarial losses (gains) | 766 | (3,283) |
Benefits paid | (256) | (250) |
Effects of exchange rate changes | 288 | (732) |
Plan amendments | 14 | 4 |
Curtailments | (1) | 0 |
Termination benefits | 0 | 1 | 5
Settlements | (53) | (16) |
Other | 34 | 28 |
Benefit obligation December 31 | 9,042 | 7,755 | $ 11,575
Funded status December 31 | 520 | 718 |
Recognized as: |  |  |
Other Assets | 1,019 | 1,052 |
Accrued and other current liabilities | (19) | (19) |
Other Noncurrent Liabilities | $ (480) | $ (315) |

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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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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