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Accumulated Other Comprehensive Income (Loss) - Components of the Company's AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, deferred taxes | $ (136) |  | $ (39) |  | $ 26
Balance | 10,042 | [1] | 8,788 |  | 8,574
Change in value, deferred tax | (24) |  | (83) |  | 74
Change in value | 88 |  | 289 |  | (239)
Amounts reclassified to earnings, deferred taxes | 0 |  | 13 |  | 21
Amounts reclassified to earnings | (3) |  | 49 |  | 39
Reclassification of stranded tax effects |  |  |  |  | 0
Amounts reclassified to retained earnings, deferred taxes |  |  | (1) |  |
Amounts reclassified to retained earnings |  |  | 6 |  |
Balance, deferred taxes | (160) |  | (136) |  | (39)
Balance | 11,531 |  | 10,042 | [1] | 8,788
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance | (803) |  | (1,147) |  | (829)
Reclassification of stranded tax effects |  |  |  |  | (118)
Balance | (718) |  | (803) |  | (1,147)
Pension and Other Postretirement Liabilities |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, before tax | (663) |  | (1,102) |  | (854)
Change in value, before tax | 105 |  | 377 |  | (306)
Amounts reclassified to earnings, before tax | (2) |  | 62 |  | 58
Amounts reclassified to retained earnings, before tax |  |  | 0 |  |
Balance, before tax | (560) |  | (663) |  | (1,102)
Investments and Other |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |
Balance, before tax | (4) |  | (6) |  | (1)
Change in value, before tax | 7 |  | (5) |  | (7)
Amounts reclassified to earnings, before tax | (1) |  | 0 |  | 2
Amounts reclassified to retained earnings, before tax |  |  | 7 |  |
Balance, before tax | $ 2 |  | $ (4) |  | $ (6)
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). 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 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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