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Income Taxes - Sources of Income (Loss) Before Taxes and Equity in Income (Loss) of Unconsolidated Subsidiaries and Affiliates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Parent country source $ (131) $ (3) $ (6)
Foreign sources (374) 1,173 1,472
Income (loss) before income taxes and equity in income of unconsolidated subsidiaries and affiliates $ (505) $ 1,170 $ 1,466