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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | $ 4 | $ 7 |
Unrecognized Tax Benefits, Period Increase (Decrease) | $ (3) | $ 1 | $ 2
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% | 35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 446 | $ 332 | $ 332
Effective Income Tax Rate Reconciliation, Percent | 35.00% | 128.00% | 17.00%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | $ 348 | $ 352 | $ 364
Additions for current year tax positions | 2 | 0 | 2
Additions for tax positions of prior years | 146 | 2 | 1
Reductions for tax positions of prior years | (26) | (5) | (1)
Settlements | 0 | 0 | (13)
Lapse of statute of limitations | (7) | (1) | (1)
Ending balance | 463 | 348 | 352
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 | 0 |
Unrecognized Tax Benefits, Income Tax Penalties Expense | $ 0 | $ 0 | $ 0
UNITED STATES |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 161 |  |

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