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Investments - Summary of Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 5,000 $ 3,214
Gross Unrealized Gains 0 1
Gross Unrealized Losses (73) (9)
Estimated Fair Value 4,927 3,206
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 558 528
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2) 0
Estimated Fair Value 556 528
Corporate notes and bonds    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,414 2,418
Gross Unrealized Gains 0 1
Gross Unrealized Losses (52) (7)
Estimated Fair Value 3,362 2,412
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 162 28
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 162 28
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 768 140
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2) 0
Estimated Fair Value 766 140
Mortgage-backed and asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 98 100
Gross Unrealized Gains 0 0
Gross Unrealized Losses (17) (2)
Estimated Fair Value $ 81 $ 98