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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | $ 2 | $ 4 |
Unrecognized Tax Benefits, Period Increase (Decrease) | $ (2) | $ (3) | $ 1
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 448 | $ 446 | $ 332
Effective Income Tax Rate Reconciliation, Percent | 35.00% | 35.00% | 128.00%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | $ 463 | $ 348 |
Additions for current year tax positions | 6 | 2 | $ 0
Additions for tax positions of prior years | 4 | 146 | 2
Reductions for tax positions of prior years | (5) | (26) | (5)
Lapse of statute of limitations | (3) | (7) | (1)
Ending balance | 465 | 463 | 348
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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