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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax rate | 26.60% |  | 24.90% |  |
Decrease in income tax percentage | 0.050 |  | 0.073 |  |
Tax benefits from settlement of IRS audit |  | $ 110 |  | $ 152 |
Tax expense from partial reversal of tax basis benefit associated with deemed repatriation tax | $ 41 |  | $ 82 |  |
Tax expense from valuation allowance on foreign tax credit carryforwards no longer realizable | 34 |  |  |  |
Tax Reform Act, net tax benefits | 13 |  | 2 |  |
Unrecognized tax benefits | 68 |  | 68 |  | $ 66
Unrecognized tax benefits that would impact the effective tax rate | 43 |  | 43 |  | 43
Unrecognized tax benefits that would impact deferred taxes | 25 |  | 25 |  | $ 23
Possible decrease in unrecognized tax benefits | $ 39 |  | $ 39 |  |

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