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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |  |
Provision for income taxes | $ 676 | $ 576 | $ 471
Undistributed earnings of foreign subsidiaries expected to be repatriated | 111 | 103 |
Undistributed earnings of foreign subsidiaries | 7,900 |  |
Operating Loss Carryforwards, Valuation Allowance | 958 |  |
Income tax loss carryforwards, subject to expiration | 441 |  |
Remaining amount of loss carryforwards that has no expiration date | 517 |  |
Unrecognized tax benefits that would reduce our effective tax rate if recognized | 427 |  |
Total accrued penalties and net accrued interest | 20 | 16 |
Aggregate resolution of uncertainties | 180 |  |
Income Taxes |  |  |
Income Tax, Nonrecurring capital loss from a legal entity restructuring |  | $ 47 |
U.S. Tax Cuts and Jobs Act |  |  |
Income Taxes |  |  |
Net Expense for U.S. Tax Cuts and Jobs Act |  |  | 36
Provision for income taxes |  |  | $ 81
Undistributed earnings of foreign subsidiaries expected to be repatriated | 700 |  |
Undistributed earnings of foreign subsidiaries | 5,200 |  |
Undistributed earnings of foreign subsidiaries considered indefinitely reinvested | 4,500 |  |
Brazil Tax Matter [Member] |  |  |
Income Taxes |  |  |
Proposed Tax Adjustments and Penalties, Foreign Tax Authority | $ 70 |  |

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