Quarterly report pursuant to Section 13 or 15(d)

Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time (Details)

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Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Unrealized Losses    
Less Than 12 Months $ (487) $ (102)
12 Months or More (143) (12)
Fair Value    
Fair Value, Less Than 12 Months 10,890 7,602
Fair Value, 12 Months or More 1,554 331
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Unrealized Losses    
Less Than 12 Months (7) (2)
12 Months or More (2) 0
Fair Value    
Fair Value, Less Than 12 Months 495 598
Fair Value, 12 Months or More 33 3
Corporate securities    
Unrealized Losses    
Less Than 12 Months (271) (66)
12 Months or More (97) (9)
Fair Value    
Fair Value, Less Than 12 Months 5,653 4,209
Fair Value, 12 Months or More 1,024 209
Municipal securities    
Unrealized Losses    
Less Than 12 Months (125) (14)
12 Months or More (11) (1)
Fair Value    
Fair Value, Less Than 12 Months 2,336 1,173
Fair Value, 12 Months or More 121 39
Asset-backed securities    
Unrealized Losses    
Less Than 12 Months (28) (5)
12 Months or More (1) 0
Fair Value    
Fair Value, Less Than 12 Months 1,097 770
Fair Value, 12 Months or More 65 33
Residential mortgage-backed securities    
Unrealized Losses    
Less Than 12 Months (29) (7)
12 Months or More (16) 0
Fair Value    
Fair Value, Less Than 12 Months 629 472
Fair Value, 12 Months or More 172 15
Commercial mortgage-backed securities    
Unrealized Losses    
Less Than 12 Months (27) (8)
12 Months or More (16) (2)
Fair Value    
Fair Value, Less Than 12 Months 680 380
Fair Value, 12 Months or More $ 139 $ 32