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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Tax Disclosure [Abstract]        
Income tax rate 26.10% 24.40% 26.30% 25.40%
Valuation Allowance Rollforward [Roll Forward]        
Balance at beginning of year     $ 2,817  
Additions to valuation allowance charged to income tax expense     233  
Reductions to valuation allowance credited to income tax benefit     (49)  
Foreign currency translation     (4)  
Balance at end of period $ 2,997   $ 2,997