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Income Taxes - Tax Expense on Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Current $ 656 $ 379 $ 268
Deferred 57 (57) 40
Income tax expense on continuing operations $ 713 $ 322 $ 308