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Investments - Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Investments    
Estimated Fair Value $ 2,794  
Short-term investments:    
Investments    
Gross Amortized Cost 1,262 $ 4,198
Gross Unrealized Gains 0 1
Gross Unrealized Losses (1) 0
Estimated Fair Value 1,261 4,199
Short-term investments: | Restricted cash    
Investments    
Gross Amortized Cost 26 22
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 26 22
Short-term investments: | Corporate debt securities    
Investments    
Gross Amortized Cost 1,196 4,151
Gross Unrealized Gains 0 1
Gross Unrealized Losses (1) 0
Estimated Fair Value 1,195 4,152
Short-term investments: | Government and agency securities    
Investments    
Gross Amortized Cost 40 25
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Estimated Fair Value 40 25
Long-term investments:    
Investments    
Gross Amortized Cost 1,609 1,733
Gross Unrealized Gains 0 1
Gross Unrealized Losses (76) (7)
Estimated Fair Value 1,533 1,727
Long-term investments: | Restricted cash    
Investments    
Gross Amortized Cost 4 0
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Estimated Fair Value 4  
Long-term investments: | Corporate debt securities    
Investments    
Gross Amortized Cost 807 954
Gross Unrealized Gains 0 1
Gross Unrealized Losses (40) (5)
Estimated Fair Value 767 950
Long-term investments: | Government and agency securities    
Investments    
Gross Amortized Cost 798 779
Gross Unrealized Gains 0 0
Gross Unrealized Losses (36) (2)
Estimated Fair Value $ 762 $ 777