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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Deferred Tax |  |  |  |  |
Balance |  | $ (136) |  | $ (39) |
Changes in value |  | (3) |  | (6) |
Amounts reclassified to earnings |  | (1) |  | (3) |
Amounts reclassified to retained earnings |  |  |  | 0 |
Balance |  | (140) |  | (48) |
Net of Tax |  |  |  |  |
Balance | [2] | 10,042 | [1] | 8,788 |
Changes in value |  | 7 |  | 13 |
Amounts reclassified to earnings |  | 3 |  | 13 |
Amounts reclassified to retained earnings |  |  |  | 7 |
Balance |  | 9,802 |  | 8,388 | [2]
Pension and Other Postretirement Liabilities |  |  |  |  |
Before Tax |  |  |  |  |
Balance |  | (663) |  | (1,102) |
Changes in value |  | 5 |  | 23 |
Amounts reclassified to earnings |  | 4 |  | 16 |
Amounts reclassified to retained earnings |  |  |  | 0 |
Balance |  | (654) |  | (1,063) |
Investments and Other |  |  |  |  |
Before Tax |  |  |  |  |
Balance |  | (4) |  | (6) |
Changes in value |  | 5 |  | (4) |
Amounts reclassified to earnings |  | 0 |  | 0 |
Amounts reclassified to retained earnings |  |  |  | 7 |
Balance |  | 1 |  | (3) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Net of Tax |  |  |  |  |
Balance | [2] | (803) |  | (1,147) |
Balance |  | $ (793) |  | $ (1,114) | [2]
[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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- Definition Reclassification From Accumulated Other Comprehensive Income To Retained Earnings. Current Period, 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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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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