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Income Taxes - Tax Rates (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Effective Income Tax Rates [Abstract]            
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 43        
Discrete tax benefit   14        
Effective Income Tax Rate 26.50%   27.10% 25.30% 27.50%  
Adjustment to current income tax balance as a result of settlement   $ 29        
Prepaid Taxes $ 370     $ 370   $ 274