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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Balance |  | $ 13,886 | $ 15,770
Net current-period other comprehensive (loss) income |  | (156) | 265
Balance |  | 13,706 | 14,488
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |
Balance | [1] | (714) | (529)
Other comprehensive (loss) income | [1],[2] | (98) | 260
Equity method affiliates | [1],[3] | (12) | 4
Net current-period other comprehensive (loss) income | [1] | (110) | 264
Balance | [1] | (824) | (265)
Other Comprehensive Income, Tax |  | 13 | 10
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Balance | [4] | (298) | (317)
Amounts reclassified from accumulated other comprehensive income (loss) | [4],[5] | (52) | 1
Net current-period other comprehensive (loss) income | [4] | (52) | 1
Balance | [4] | (350) | $ (316)
Amounts reclassified from accumulated other comprehensive income, Tax |  | $ 52 |
[1] | All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss.
[2] | For the three months ended March 31, 2019 and 2018, amounts are net of total tax benefit of $13 million and tax expense of $10 million, respectively.
[3] | Tax effects are not significant.
[4] | All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss. For the three months ended March 31, 2019, the amount consisted of $52 million in tax loss due to reclass of stranded tax effects. Refer to Note 1 (Significant Accounting Policies) to the consolidated financial statements for additional information.
[5] | For the three months ended March 31, 2018, tax amounts are not significant

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