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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, Percent 20.10% 20.50% 15.90% 22.20%
Deferred Tax Assets, Tax Deferred Expense $ 364   $ 364