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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Postretirement Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | $ 1,102 | $ 968 |
Actual return on plan assets | 175 | 203 |
Company contributions | 19 | 14 |
Effects of exchange rate changes | 0 | 0 |
Benefits paid | (93) | (104) |
Settlements | 0 | 0 |
Other | 18 | 21 |
Fair value of plan assets December 31 | 1,221 | 1,102 | $ 968
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 1,673 | 1,615 |
Service cost | 52 | 48 | 57
Interest cost | 57 | 69 | 69
Actuarial (gains) losses | (98) | 21 |
Benefits paid | (93) | (104) |
Effects of exchange rate changes | (3) | 1 |
Plan amendments | 0 | 0 |
Curtailments | (1) | 0 |
Termination benefits | 2 | 5 | 3
Settlements | 0 | 0 |
Other | 18 | 18 |
Benefit obligation December 31 | 1,607 | 1,673 | 1,615
Funded status December 31 | (386) | (571) |
Recognized as: |  |  |
Other Assets | 0 | 0 |
Accrued and other current liabilities | (9) | (10) |
Other Noncurrent Liabilities | (377) | (561) |
United States | Pension Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | 11,361 | 9,648 |
Actual return on plan assets | 1,908 | 2,165 |
Company contributions | 199 | 130 |
Effects of exchange rate changes | 0 | 0 |
Benefits paid | (751) | (582) |
Settlements | (45) | 0 |
Other | 0 | 0 |
Fair value of plan assets December 31 | 12,672 | 11,361 | 9,648
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 13,003 | 10,620 |
Service cost | 360 | 293 | 326
Interest cost | 431 | 458 | 432
Actuarial (gains) losses | 1,594 | 2,165 |
Benefits paid | (751) | (582) |
Effects of exchange rate changes | 0 | 0 |
Plan amendments | 0 | 0 |
Curtailments | 11 | 18 |
Termination benefits | 10 | 31 | 19
Settlements | (45) | 0 |
Other | 0 | 0 |
Benefit obligation December 31 | 14,613 | 13,003 | 10,620
Funded status December 31 | (1,941) | (1,642) |
Recognized as: |  |  |
Other Assets | 0 | 0 |
Accrued and other current liabilities | (82) | (92) |
Other Noncurrent Liabilities | (1,859) | (1,550) |
International | Pension Benefits |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |
Fair value of plan assets January 1 | 10,163 | 8,580 |
Actual return on plan assets | 1,026 | 1,505 |
Company contributions | 387 | 262 |
Effects of exchange rate changes | 746 | 31 |
Benefits paid | (215) | (230) |
Settlements | (117) | (12) |
Other | 59 | 27 |
Fair value of plan assets December 31 | 12,049 | 10,163 | 8,580
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Benefit obligation January 1 | 10,612 | 9,083 |
Service cost | 301 | 238 | 238
Interest cost | 137 | 177 | 178
Actuarial (gains) losses | 1,036 | 1,313 |
Benefits paid | (215) | (230) |
Effects of exchange rate changes | 794 | 4 |
Plan amendments | (64) | 1 |
Curtailments | (8) | 3 |
Termination benefits | 3 | 8 | 2
Settlements | (117) | (12) |
Other | 55 | 27 |
Benefit obligation December 31 | 12,534 | 10,612 | $ 9,083
Funded status December 31 | (485) | (449) |
Recognized as: |  |  |
Other Assets | 941 | 837 |
Accrued and other current liabilities | (13) | (18) |
Other Noncurrent Liabilities | $ (1,413) | $ (1,268) |

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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=118255775&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=118257860&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=118255775&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 (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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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