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Investments - Fair Values by Contractual Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 7,304 $ 9,795
Maturing after one year through three years 0 50
Total available-for-sale investments $ 7,304 $ 9,845