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Short-term and Long-term Investments, Restricted Deposits - Fair Value of Available-for-Sale Investments in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Unrealized Losses    
Less Than 12 Months $ (620) $ (102)
12 Months or More (744) (12)
Fair Value    
Less Than 12 Months 10,075 7,602
12 Months or More 5,747 331
U.S. Treasury securities and obligations of U.S. government corporations and agencies    
Unrealized Losses    
Less Than 12 Months (5) (2)
12 Months or More (11) 0
Fair Value    
Less Than 12 Months 342 598
12 Months or More 184 3
Corporate securities    
Unrealized Losses    
Less Than 12 Months (340) (66)
12 Months or More (438) (9)
Fair Value    
Less Than 12 Months 5,368 4,209
12 Months or More 3,400 209
Municipal securities    
Unrealized Losses    
Less Than 12 Months (142) (14)
12 Months or More (138) (1)
Fair Value    
Less Than 12 Months 2,437 1,173
12 Months or More 995 39
Asset-backed securities    
Unrealized Losses    
Less Than 12 Months (29) (5)
12 Months or More (41) 0
Fair Value    
Less Than 12 Months 786 770
12 Months or More 486 33
Residential mortgage-backed securities    
Unrealized Losses    
Less Than 12 Months (55) (7)
12 Months or More (66) 0
Fair Value    
Less Than 12 Months 629 472
12 Months or More 352 15
Commercial mortgage-backed securities    
Unrealized Losses    
Less Than 12 Months (49) (8)
12 Months or More (50) (2)
Fair Value    
Less Than 12 Months 513 380
12 Months or More $ 330 $ 32