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Income Tax (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |
Proceeds from Income Tax Refunds | $ 20 | $ 59 | $ 22 |
Cash paid for income taxes | 388 | 167 | 66 |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 5 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 50 |  |  |
Cash paid for income taxes | 388 | 167 | 66 |
Deferred Tax Assets, Valuation Allowance | 218 | 251 |  |
Proceeds from Income Tax Refunds | 20 | 59 | 22 |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability | 1,800 | 2,700 |  |
Subsidiary Net Operating Loss |  | 20 |  |
Operating Loss Carryforwards | 920 |  |  |
Unrecognized Tax Benefits | 34 | 342 | 333 | $ 325
Unrecognized Tax Benefits, Interest on Income Taxes Expense | (31) | (11) | $ (12) |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 3 | $ 34 |  |
Foreign Tax Authority | Revenue Commissioners, Ireland |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 26 |  |  |

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