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Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Other comprehensive (loss) income, net of tax | $ (360) | $ 296 | $ (208) | $ 552 |
Unrealized Investment Gains |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 0 | 16 | 14 | 19 |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (14)
Other comprehensive income (loss) before reclassifications | 0 | 14 | 0 | 11 |
Amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0 |
Other comprehensive (loss) income, net of tax | 0 | 14 | 0 | 11 |
Balance, ending of period | 0 | 30 | 0 | 30 |
Pension/Postretirement Plans Gains (Losses) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (2,963) | (3,208) | (2,892) | (3,232) |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | 0
Other comprehensive income (loss) before reclassifications | 129 | (40) | 29 | (46) |
Amounts reclassified from accumulated other comprehensive income | 27 | 33 | 56 | 63 |
Other comprehensive (loss) income, net of tax | 156 | (7) | 85 | 17 |
Balance, ending of period | (2,807) | (3,215) | (2,807) | (3,215) |
Foreign Currency Translation Gains (Losses) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (942) | (1,645) | (1,165) | (1,880) |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | 0
Other comprehensive income (loss) before reclassifications | (516) | 289 | (293) | 524 |
Amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0 |
Other comprehensive (loss) income, net of tax | (516) | 289 | (293) | 524 |
Balance, ending of period | (1,458) | (1,356) | (1,458) | (1,356) |
AOCI Attributable to Parent |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (3,905) | (4,837) | (4,043) | (5,093) |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (14)
Other comprehensive income (loss) before reclassifications | (387) | 263 | (264) | 489 |
Amounts reclassified from accumulated other comprehensive income | 27 | 33 | 56 | 63 |
Other comprehensive (loss) income, net of tax | (360) | 296 | (208) | 552 |
Balance, ending of period | $ (4,265) | $ (4,541) | $ (4,265) | $ (4,541) |

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