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Income Taxes - Income Tax Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Deferred taxes (benefits)        
Total income taxes $ 409 $ 259 $ 1,173 $ 854