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Income Taxes (Reconciliation of Valuation Allowance of Deferred Tax Assets) (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 217 | $ 191 | $ 234
Change in assessment (a) | 0 | 1 | (2)
Current year operations | 4 | 4 | 3
Other comprehensive income | (4) | 3 | (1)
Foreign currency and other | (16) | 18 | (43)
Balance at end of year | $ 201 | $ 217 | $ 191

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