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Employee Benefit Plans - Summary of Change in Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
U.S. |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | $ 10,177 |  |
Employer contributions | 950 |  |
Fair value of plan assets at December 31 | 9,930 | $ 10,177 |
Int’l. |  |  |
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 4,791 |  |
Employer contributions | 263 |  |
Fair value of plan assets at December 31 | 5,363 | 4,791 |
Pension Benefits | U.S. |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 14,465 | 11,726 |
Service cost | 497 | 406 | $ 480
Interest cost | 353 | 397 | 370
Plan participants’ contributions | 0 | 0 |
Plan amendments | 0 | 0 |
Actuarial (gain) loss | 1,782 | 2,922 |
Foreign currency exchange rate changes | 0 | 0 |
Benefits paid | (2,045) | (1,035) |
Curtailment | 92 | 0 |
Acquisitions | 22 | 49 |
Benefit obligation at December 31 | 15,166 | 14,465 | 11,726
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 10,177 | 8,532 |
Actual return on plan assets | 848 | 1,548 |
Foreign currency exchange rate changes | 0 | 0 |
Employer contributions | 950 | 1,096 |
Plan participants’ contributions | 0 | 0 |
Benefits paid | (2,045) | (1,035) |
Acquisitions | 0 | 36 |
Fair value of plan assets at December 31 | 9,930 | 10,177 | 8,532
Funded status at December 31 | (5,236) | (4,288) |
Pension Benefits | Int’l. |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 5,680 | 4,820 |
Service cost | 130 | 139 | 141
Interest cost | 175 | 199 | 206
Plan participants’ contributions | 3 | 4 |
Plan amendments | 0 | 29 |
Actuarial (gain) loss | 550 | 673 |
Foreign currency exchange rate changes | 158 | 121 |
Benefits paid | (368) | (302) |
Curtailment | (21) | (3) |
Acquisitions | 0 | 0 |
Benefit obligation at December 31 | 6,307 | 5,680 | 4,820
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 4,791 | 4,142 |
Actual return on plan assets | 500 | 566 |
Foreign currency exchange rate changes | 174 | 115 |
Employer contributions | 263 | 266 |
Plan participants’ contributions | 3 | 4 |
Benefits paid | (368) | (302) |
Acquisitions | 0 | 0 |
Fair value of plan assets at December 31 | 5,363 | 4,791 | 4,142
Funded status at December 31 | (944) | (889) |
Other Benefits |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at January 1 | 2,520 | 2,430 |
Service cost | 38 | 36 | 42
Interest cost | 71 | 96 | 94
Plan participants’ contributions | 59 | 72 |
Plan amendments | 0 | 0 |
Actuarial (gain) loss | 191 | 125 |
Foreign currency exchange rate changes | (1) | 2 |
Benefits paid | (214) | (240) |
Curtailment | (14) | 0 |
Divestitures | 0 | (1) |
Benefit obligation at December 31 | 2,650 | 2,520 | 2,430
Change in Plan Assets |  |  |
Fair value of plan assets at January 1 | 0 | 0 |
Actual return on plan assets | 0 | 0 |
Foreign currency exchange rate changes | 0 | 0 |
Employer contributions | 155 | 168 |
Plan participants’ contributions | 59 | 72 |
Benefits paid | (214) | (240) |
Divestitures | 0 | 0 |
Fair value of plan assets at December 31 | 0 | 0 | $ 0
Funded status at December 31 | $ (2,650) | $ (2,520) |

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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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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 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/disclosureRef -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 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=118255775&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=118257860&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=118255775&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=118255775&loc=d3e1928-114920 + Details
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