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Employee Postretirement Benefits (Summarized Financial Information about Postretirement plans, Excluding Defined Contribution Retirement Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Pension Plans |  |  |  |
Benefit obligation at beginning of year |  | $ 4,047 | $ 3,687 |
Service cost |  | 22 | 21 | $ 36
Interest cost |  | 95 | 121 | 128
Actuarial (gain) loss(a) | [1] | 333 | 446 |
Currency and other |  | 134 | 51 |
Benefit payments from plans |  | (169) | (142) |
Direct benefit payments |  | (8) | (10) |
Settlements and curtailments |  | (113) | (127) |
Benefit obligation at end of year |  | 4,341 | 4,047 | 3,687
Fair value of plan assets at beginning of year |  | 3,803 | 3,398 |
Actual return on plan assets |  | 489 | 572 |
Employer contributions |  | 40 | 50 |
Currency and other |  | 120 | 51 |
Benefit payments |  | (169) | (142) |
Settlements |  | (90) | (126) |
Fair value of plan assets at end of year |  | 4,193 | 3,803 | 3,398
Funded Status |  | (148) | (244) |
Other Postretirement Benefit Plans |  |  |  |
Benefit obligation at beginning of year |  | 693 | 673 |
Service cost |  | 8 | 8 | 11
Interest cost |  | 23 | 28 | 28
Actuarial (gain) loss(a) | [1] | 42 | 36 |
Currency and other |  | (10) | 0 |
Benefit payments from plans |  | 0 | 0 |
Direct benefit payments |  | (47) | (52) |
Settlements and curtailments |  | 0 | 0 |
Benefit obligation at end of year |  | 709 | 693 | 673
Fair value of plan assets at beginning of year |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Employer contributions |  | 0 | 0 |
Currency and other |  | 0 | 0 |
Benefit payments |  | 0 | 0 |
Settlements |  | 0 | 0 |
Fair value of plan assets at end of year |  | 0 | 0 | $ 0
Funded Status |  | $ (709) | $ (693) |
[1] | The actuarial net losses in 2020 and 2019 were primarily due to discount rate decreases in 2020 and 2019.

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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=118257860&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=118255775&loc=d3e1928-114920 Reference 3: 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=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 5: 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=118255775&loc=d3e1928-114920 + Details
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