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Income Taxes - Possible Changes of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reasonably possible change in unrecognized tax benefits    
Foreign tax credit carryovers $ 130 $ 117
Unused foreign tax credits expiring in 2021 through 2030 85  
Unused foreign tax credits carried over indefinitely 45  
Operating and capital loss carryforwards with indefinite life 158  
Operating and capital loss carryforwards expire between 2021 and 2040 118  
Unused research tax credits expiring from 2021 to 2039 $ 18  
Period during which unrecognized tax benefits are reasonably possible of being settled as a result of audit settlements or statute expirations 12 months  
Maximum    
Reasonably possible change in unrecognized tax benefits    
Reasonably possible decrease in unrecognized tax benefits related to audit settlements or statute expirations $ 19