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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ("AOCI") The tables below present the components of the Company's AOCI, net of tax (in millions):
|  | Pension and Other Postretirement Liabilities |  | Investments and Other |  | Deferred Taxes |  | Total
Balance at December 31, 2017 |  | $ | (1,102) |  |  | $ | (6) |  |  | $ | (39) |  |  | $ | (1,147) |
Change in value |  | 377 |  |  | (5) |  |  | (83) |  |  | 289 |
Amounts reclassified to earnings |  | 62 |  | (a) | — |  |  | (13) |  |  | 49 |
Amounts reclassified to retained earnings ("RE") |  | — |  |  | 7 |  | (b) | (1) |  | (b) | 6 |
Balance at December 31, 2018 |  | (663) |  |  | (4) |  |  | (136) |  |  | (803) |
Change in value |  | 105 |  |  | 7 |  |  | (24) |  |  | 88 |
Amounts reclassified to earnings |  | (2) |  | (a) | (1) |  |  | — |  |  | (3) |
Balance at December 31, 2019 |  | (560) |  |  | 2 |  |  | (160) |  |  | (718) |
Change in value |  | (993) |  |  | — |  |  | 221 |  |  | (772) |
Amounts reclassified to earnings |  | 451 |  | (a) | — |  |  | (100) |  |  | 351 |
Balance at December 31, 2020 |  | $ | (1,102) |  |  | $ | 2 |  |  | $ | (39) |  |  | $ | (1,139) |
(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs. See Note 7 of this report for additional information on pensions and other postretirement liabilities. (b) These amounts represent the reclassification from AOCI to RE of the unrealized loss, and related tax, on the Company's investment in Azul Linhas Aéreas Brasileiras S.A. ("Azul") which was classified as an available-for-sale security prior to the Company adopting Accounting Standards Update No. 2016-01, Financial Instruments—Overall (Subtopic 825-10) effective January 1, 2018.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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