v3.8.0.1

Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Tax rate |  | 35.00% |  |
Total income tax expense (benefit) |  | $ 2,880 |  |
Tax benefit from the reduction in net deferred tax liabilities |  | 1,592 |  |
Tax benefit from the adoption of a modified territorial international tax system |  | 1,785 |  |
Tax expense related to the one-time toll tax |  | 497 |  |
Tax expense related to remeasuring Korea’s deferred tax assets and liabilities |  | 26 |  |
AFE change in tax law, tax benefit |  |  |  | $ 108
Tax expense reversal resulting from AFE |  |  |  | 108
DRD constituting non-taxable investment income |  | 280 | $ 266 | 296
Non-taxable investment income |  | $ 369 | 352 | 341
Percent of income tax expense (benefit) |  | 5.00% |  |
Tax expense (benefit) | $ (3) |  |  |
Income (loss) from domestic operations |  | $ 2,541 | 1,242 | 4,235
Income (loss) from foreign operations |  | $ 3,945 | $ 4,463 | $ 3,534

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