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Available-for-sale Debt Securities and Equity Securities - Summary of Available-for-Sale Debt Securities In Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Gross Unrealized Losses    
Less Than 12 Months $ (22) $ (4)
12 Months or Longer (12) 0
Total (34) (4)
Estimated Fair Value    
Less Than 12 Months 1,204 2,022
12 Months or Longer 705 10
Total 1,908 2,032
U.S. treasury securities    
Gross Unrealized Losses    
Less Than 12 Months (2) (1)
12 Months or Longer (3) 0
Total (5) (1)
Estimated Fair Value    
Less Than 12 Months 174 402
12 Months or Longer 206 0
Total 379 402
U.S. government agencies securities    
Gross Unrealized Losses    
Less Than 12 Months 0 0
12 Months or Longer 0 0
Total 0 0
Estimated Fair Value    
Less Than 12 Months 21 5
12 Months or Longer 0 0
Total 21 5
Non-U.S. government securities    
Gross Unrealized Losses    
Less Than 12 Months 0 0
12 Months or Longer 0 0
Total 0 0
Estimated Fair Value    
Less Than 12 Months 31 46
12 Months or Longer 3 0
Total 34 46
Certificates of deposit    
Gross Unrealized Losses    
Less Than 12 Months 0 0
12 Months or Longer 0 0
Total 0 0
Estimated Fair Value    
Less Than 12 Months 0 0
12 Months or Longer 0 0
Total 0 0
Corporate debt securities    
Gross Unrealized Losses    
Less Than 12 Months (17) (2)
12 Months or Longer (8) 0
Total (26) (2)
Estimated Fair Value    
Less Than 12 Months 774 1,159
12 Months or Longer 439 0
Total 1,213 1,159
Residential mortgage and asset-backed securities    
Gross Unrealized Losses    
Less Than 12 Months (2) (1)
12 Months or Longer (1) 0
Total (3) (1)
Estimated Fair Value    
Less Than 12 Months 205 410
12 Months or Longer 56 10
Total $ 261 $ 420