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Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss (gain) amortization included in benefit cost | $ 198 | $ 112 | $ 186
Prior service (cost) credit arising during the period | (3) | (11) | 2
Total | 195 | 101 | 188
Net loss (gain) amortization included in benefit cost | (18) | (10) | 1
Prior service credit amortization included in benefit cost | (73) | (78) | (84)
Total | (91) | (88) | (83)
United States | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss (gain) amortization included in benefit cost | (448) | (816) | (397)
Prior service (cost) credit arising during the period | (1) | (4) | (4)
Total | (449) | (820) | (401)
Net loss (gain) amortization included in benefit cost | 303 | 151 | 232
Prior service credit amortization included in benefit cost | (49) | (49) | (50)
Total | 254 | 102 | 182
International | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss (gain) amortization included in benefit cost | (407) | (227) | (505)
Prior service (cost) credit arising during the period | 62 | (1) | (10)
Total | (345) | (228) | (515)
Net loss (gain) amortization included in benefit cost | 127 | 64 | 84
Prior service credit amortization included in benefit cost | (18) | (12) | (13)
Total | $ 109 | $ 52 | $ 71

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- Definition Amount, before tax, of 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 (i) -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 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=121641772&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 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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