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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowances | $ 200 | $ 207 |
Increase (decrease) in valuation allowance | (7) | (10) |
Income from foreign sources | 824 |  |
Income from domestic sources | 432 |  |
Undistributed earnings of foreign subsidiaries | 2,300 |  |
Unrecognized tax benefits | 83 |  |
Decrease in unrecognized tax benefits | 35 |  |
Income tax penalties and interest accrued | 23 | 19 |
Income tax penalties and interest expense | 3 | (1) | $ 5
Due to former parent upon receipt from IRS | 5 | 5 |
Domestic Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase (decrease) in valuation allowance | $ 90 | 96 | 163
Federal Deferred Tax Asset |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase (decrease) in valuation allowance |  |  | (223)
Foreign Tax Credit Carryforwards |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase (decrease) in valuation allowance |  | $ (17) | (152)
Other Net Deferred Tax Assets |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase (decrease) in valuation allowance |  |  | $ (71)

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