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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax rate | 25.50% |  |  | 25.10% |  |
Decrease in income tax percentage | 0.039 |  |  | 0.061 |  |
Tax expense for reserves related to the calculation of certain foreign tax credits |  |  | $ 114 |  | $ 114 |
Tax benefit for release of valuation allowance related to deferred income tax assets |  | $ 232 |  |  | 232 |
Tax benefits related to effective settlement of IRS audit |  |  |  |  | 152 |
Tax expense from partial reversal of the tax basis benefit associated with deemed repatriation tax | $ 40 |  |  | $ 122 |  |
Tax expense for valuation allowance on foreign tax credit carryforwards that are not realizable as a result of updates to provisional estimates recorded for the Tax Reform Act | 17 |  |  | 51 |  |
Tax benefits for the reversal of tax accruals no longer required |  | $ 36 |  |  | $ 36 |
Tax Reform Act, net tax expense (benefit) | (1) |  |  | 1 |  |
Unrecognized tax benefits | (34) |  |  | (34) |  | $ 66
Unrecognized tax benefits that would impact the effective tax rate | 58 |  |  | 58 |  | 43
Unrecognized tax benefits that would impact deferred taxes | (92) |  |  | (92) |  | $ 23
Possible decrease in unrecognized tax benefits | $ (75) |  |  | $ (75) |  |

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