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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Deferred Tax |  |  |  |  |
Balance | $ (144) | $ (140) | $ (160) |  | $ (136)
Changes in value | 156 | 7 | 171 |  | 4
Amounts reclassified to earnings | (17) | (2) | (16) |  | (3)
Balance | (5) | (135) | (5) |  | (135)
Net of Tax |  |  |  |  |
Balance | 9,418 | 9,802 | 11,531 | [1] | 10,042
Changes in value | (548) | (20) | (598) |  | (13)
Amounts reclassified to earnings | 60 | 6 | 57 |  | 9
Balance | 8,517 | 10,320 | 8,517 |  | 10,320
Pension and Other Postretirement Liabilities |  |  |  |  |
Before Tax |  |  |  |  |
Balance | (613) | (654) | (560) |  | (663)
Changes in value | (721) | (29) | (770) |  | (24)
Amounts reclassified to earnings | 77 | 8 | 73 |  | 12
Balance | (1,257) | (675) | (1,257) |  | (675)
Investments and Other |  |  |  |  |
Before Tax |  |  |  |  |
Balance | (14) | 1 | 2 |  | (4)
Changes in value | 17 | 2 | 1 |  | 7
Amounts reclassified to earnings | 0 | 0 | 0 |  | 0
Balance | 3 | 3 | 3 |  | 3
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Net of Tax |  |  |  |  |
Balance | (771) | (793) | (718) |  | (803)
Balance | $ (1,259) | $ (807) | $ (1,259) |  | $ (807)
[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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