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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Deferred Tax |  |  |  |  |
Balance | $ (5) | $ (135) | $ (160) |  | $ (136)
Changes in value | 2 | (87) | 173 |  | (83)
Amounts reclassified to earnings | (74) | 1 | (90) |  | (2)
Balance | (77) | (221) | (77) |  | (221)
Net of Tax |  |  |  |  |
Balance | 8,517 | 10,320 | 11,531 | [1] | 10,042
Changes in value | (9) | 307 | (607) |  | 294
Amounts reclassified to earnings | 259 | (4) | 316 |  | 5
Balance | 7,003 | 11,301 | 7,003 |  | 11,301
Pension and Other Postretirement Liabilities |  |  |  |  |
Before Tax |  |  |  |  |
Balance | (1,257) | (675) | (560) |  | (663)
Changes in value | (11) | 394 | (781) |  | 370
Amounts reclassified to earnings | 333 | (4) | 406 |  | 8
Balance | (935) | (285) | (935) |  | (285)
Investments and Other |  |  |  |  |
Before Tax |  |  |  |  |
Balance | 3 | 3 | 2 |  | (4)
Changes in value | 0 | 0 | 1 |  | 7
Amounts reclassified to earnings | 0 | (1) | 0 |  | (1)
Balance | 3 | 2 | 3 |  | 2
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Net of Tax |  |  |  |  |
Balance | (1,259) | (807) | (718) |  | (803)
Balance | $ (1,009) | $ (504) | $ (1,009) |  | $ (504)
[1] | Transition adjustment due to the adoption of Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses. See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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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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