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Investments - Fair Values of Interest-bearing Securities by Balance Sheet Location (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Marketable securities $ 1 $ 1,676
Total interest-bearing securities 31,065 4,335
Available-for-sale investments    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 31,064 2,659
Marketable securities 1 1,676
Total interest-bearing securities $ 31,065 $ 4,335