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Income Tax (Pre-tax Income Foreign and Domestic) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]                      
Income (Loss) from Continuing Operations before Income Taxes, Domestic                 $ 79 $ 871 $ 626
Income (Loss) from Continuing Operations before Income Taxes, Foreign                 474 261 220
Income before income taxes $ 169 $ 285 $ 195 $ (96) $ 308 $ 347 $ 260 $ 217 $ 553 $ 1,132 $ 846