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Debt - Credit Facilities (Details) - Revolving Credit Agreement - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Credit agreement term   5 years  
Long-term line of credit   $ 1,000 $ 3,000
Amount outstanding $ 0 0  
Amount borrowed 0 $ 0  
Year Ending December 2021      
Debt Instrument [Line Items]      
Maximum common stock dividends and share repurchases 250    
Year Ending December 2022      
Debt Instrument [Line Items]      
Maximum common stock dividends and share repurchases $ 400