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Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Other comprehensive income, net of tax | $ 152 | $ 256 |
Unrealized Investment Gains |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | 14 | 19 |
Cumulative effect of new accounting principle in period of adoption |  |  | $ (14)
Other comprehensive (loss) income before reclassifications | 0 | (3) |
Amounts reclassified from accumulated other comprehensive income | 0 | 0 |
Other comprehensive income, net of tax | 0 | (3) |
Balance, ending of period | 0 | 16 |
Pension/Postretirement Plans Gains (Losses) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | (2,892) | (3,232) |
Cumulative effect of new accounting principle in period of adoption |  |  | 0
Other comprehensive (loss) income before reclassifications | (100) | (6) |
Amounts reclassified from accumulated other comprehensive income | 29 | 30 |
Other comprehensive income, net of tax | (71) | 24 |
Balance, ending of period | (2,963) | (3,208) |
Foreign Currency Translation Gains (Losses) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | (1,165) | (1,880) |
Cumulative effect of new accounting principle in period of adoption |  |  | 0
Other comprehensive (loss) income before reclassifications | 223 | 235 |
Amounts reclassified from accumulated other comprehensive income | 0 | 0 |
Other comprehensive income, net of tax | 223 | 235 |
Balance, ending of period | (942) | (1,645) |
AOCI Attributable to Parent |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | (4,043) | (5,093) |
Cumulative effect of new accounting principle in period of adoption |  |  | $ (14)
Other comprehensive (loss) income before reclassifications | 123 | 226 |
Amounts reclassified from accumulated other comprehensive income | 29 | 30 |
Other comprehensive income, net of tax | 152 | 256 |
Balance, ending of period | $ (3,905) | $ (4,837) |

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