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Income Tax (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 32 |  |  |
Proceeds from Income Tax Refunds | 59 | $ 22 | $ 2 |
Cash paid for income taxes | 167 | 66 | 144 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 155 |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 312 |  |  |
Cash paid for income taxes | 167 | 66 | 144 |
Tax Adjustments, Settlements, and Unusual Provisions | 0 | 0 | (62) |
Deferred Tax Assets, Valuation Allowance | 251 | 236 |  |
Proceeds from Income Tax Refunds | 59 | 22 | 2 |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability | 2,700 | 1,600 |  |
Subsidiary Net Operating Loss | 20 | 44 |  |
Operating Loss Carryforwards | 900 |  |  |
Unrecognized Tax Benefits | 342 | 333 | 325 | $ 321
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 11 | 12 | $ (3) |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | $ 34 | $ 23 |  |

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