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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Deferred Tax |  |  |  |  |  |  |
Balance | $ (135) | $ (52) |  | $ (136) |  | $ (39) |
Changes in value | (87) | 0 |  | (83) |  | (6) |
Amounts reclassified to earnings | 1 | (3) |  | (2) |  | (10) |
Amounts reclassified to retained earnings |  |  |  |  |  | 0 |
Balance | (221) | (55) |  | (221) |  | (55) |
Net of Tax |  |  |  |  |  |  |
Balance | 10,320 | 8,691 | [1] | 10,042 | [1],[2] | 8,788 | [1]
Changes in value | 307 | 1 |  | 294 |  | 16 |
Amounts reclassified to earnings | (4) | 12 |  | 5 |  | 35 |
Amounts reclassified to retained earnings |  |  |  |  |  | 7 |
Balance | 11,301 | 9,518 | [1] | 11,301 |  | 9,518 | [1]
Pension and Other Postretirement Liabilities |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |
Balance | (675) | (1,048) |  | (663) |  | (1,102) |
Changes in value | 394 | 0 |  | 370 |  | 24 |
Amounts reclassified to earnings | (4) | 15 |  | 8 |  | 45 |
Amounts reclassified to retained earnings |  |  |  |  |  | 0 |
Balance | (285) | (1,033) |  | (285) |  | (1,033) |
Investments and Other |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |
Balance | 3 | (2) |  | (4) |  | (6) |
Changes in value | 0 | 1 |  | 7 |  | (2) |
Amounts reclassified to earnings | (1) | 0 |  | (1) |  | 0 |
Amounts reclassified to retained earnings |  |  |  |  |  | 7 |
Balance | 2 | (1) |  | 2 |  | (1) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |
Net of Tax |  |  |  |  |  |  |
Balance | (807) | (1,102) | [1] | (803) | [1] | (1,147) | [1]
Balance | $ (504) | $ (1,089) | [1] | $ (504) |  | $ (1,089) | [1]
[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 I, Item 1 of this report for additional information.
[2] | 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 I, Item 1 of this report for additional information.

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