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Investments - Estimated fair values of short and long-term investments classified by date of contractual maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
One year or less (including restricted cash of $26) $ 1,261  
One year through two years (including restricted cash of $4) 560  
Two years through three years 657  
Three years through four years 242  
Four years through five years 74  
Estimated Fair Value 2,794  
Short-term investments:    
Debt Securities, Available-for-sale [Line Items]    
Restricted cash 1,262 $ 4,198
Estimated Fair Value 1,261 4,199
Short-term investments: | Restricted cash    
Debt Securities, Available-for-sale [Line Items]    
Restricted cash 26 22
Estimated Fair Value 26 22
Long-term investments:    
Debt Securities, Available-for-sale [Line Items]    
Restricted cash 1,609 1,733
Estimated Fair Value 1,533 1,727
Long-term investments: | Restricted cash    
Debt Securities, Available-for-sale [Line Items]    
Restricted cash 4 $ 0
Estimated Fair Value $ 4