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Accumulated Other Comprehensive Income (Loss) - Components of the Company's AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, deferred taxes | $ (39) |  | $ 26 |  | $ (256)
Balance | 8,734 | [1] | 8,574 |  | 8,966
Other comprehensive income (loss) before reclassifications, deferred taxes | (83) |  | 74 |  | 187
Other comprehensive income (loss) before reclassifications, net of tax | 289 |  | (239) |  | (334)
Amounts reclassified from accumulated other comprehensive income, deferred taxes | (13) |  | (21) |  | 95
Amounts reclassified from accumulated other comprehensive income, net of tax | 49 |  | 39 |  | 336
Reclassification of stranded tax effects, tax |  |  | (118) |  |
Amounts reclassified to retained earnings, deferred taxes | (1) |  |  |  |
Amounts reclassified to retained earnings, net of taxes | 6 |  |  |  |
Balance, deferred taxes | (136) |  | (39) |  | 26
Balance | 9,995 |  | 8,734 | [1] | 8,574
Decrease (increase) in prior service credits | 3 |  | 0 |  | (30)
Decrease (increase) in actuarial losses | 380 |  | 306 |  | 560
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance | (1,147) |  | (829) |  | (831)
Reclassification of stranded tax effects |  |  | (118) |  |
Balance | (803) |  | (1,147) |  | (829)
Pension and Other Postretirement Liabilities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, before tax | (1,102) |  | (854) |  | (363)
Other comprehensive income (loss) before reclassifications, before tax | 377 |  | (306) |  | (517)
Amounts reclassified from accumulated other comprehensive income, before tax | 62 |  | 58 |  | 26
Amounts reclassified to retained earnings, before tax | 0 |  |  |  |
Balance, before tax | (663) |  | (1,102) |  | (854)
Fuel Derivatives Contracts |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, before tax | 0 |  | (2) |  | (215)
Other comprehensive income (loss) before reclassifications, before tax | 0 |  | 0 |  | (4)
Amounts reclassified from accumulated other comprehensive income, before tax | 0 |  | 2 |  | 217
Amounts reclassified to retained earnings, before tax | 0 |  |  |  |
Balance, before tax | 0 |  | 0 |  | (2)
Investments and Other |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, before tax | (6) |  | 1 |  | 3
Other comprehensive income (loss) before reclassifications, before tax | (5) |  | (7) |  | 0
Amounts reclassified from accumulated other comprehensive income, before tax | 0 |  | 0 |  | (2)
Amounts reclassified to retained earnings, before tax | 7 |  |  |  |
Balance, before tax | $ (4) |  | $ (6) |  | $ 1
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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- Definition Reclassification From Accumulated Other Comprehensive Income, To Retained Earnings Current Period, before Tax + References No definition available. + Details
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- Definition Reclassification from accumulated other comprehensive income, to retained earnings current period, net of tax. + References No definition available. + Details
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- Definition Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect + References No definition available. + Details
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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Amount, after 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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