v3.20.4
Financial Instruments - Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Debt securities, amortized cost $ 9,991 $ 8,380
Debt securities, gross unrealized gains 138 6
Debt securities, gross unrealized losses (5) (47)
Debt securities, fair value 10,124 8,340
Debt securities maturities, within 1 year, fair value 9,959  
Debt securities maturities, over 1 to 5 years, fair value 136  
Debt securities maturities, over 5 years, fair value 29  
Government and agency debt - non-U.S. [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost 7,593 4,895
Available-for-sale debt securities, gross unrealized gain 136 6
Available-for-sale debt securities, gross unrealized loss (4) (38)
Available-for-sale securities, debt maturities 7,725 4,863
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value 7,719  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value 6  
Available-for-sale securities, debt maturities, over 5 years, fair value 0  
Available-for-sale securities, debt maturities 7,725 4,863
Debt Securities, Held-to-maturity, Maturity [Abstract]    
Held-to-maturity securities, amortized cost 5 803
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair value 5 803
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held-to-maturity securities, debt maturities, within 1 year, fair value 0  
Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value 0  
Held-to-maturity securities, debt maturities, over 5 years, fair value 5  
Government and agency - U.S. [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost 1,104 1,120
Available-for-sale debt securities, gross unrealized gain 0 0
Available-for-sale debt securities, gross unrealized loss (1) (6)
Available-for-sale securities, debt maturities 1,103 1,114
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value 982  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value 121  
Available-for-sale securities, debt maturities, over 5 years, fair value 0  
Available-for-sale securities, debt maturities 1,103 1,114
Corporate and Other [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost [1] 1,006 1,027
Available-for-sale debt securities, gross unrealized gain [1] 2 0
Available-for-sale debt securities, gross unrealized loss [1] 0 (2)
Available-for-sale securities, debt maturities [1] 1,008 1,025
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value [1] 1,008  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value [1] 0  
Available-for-sale securities, debt maturities, over 5 years, fair value [1] 0  
Available-for-sale securities, debt maturities [1] 1,008 1,025
Time deposits and other [Member]    
Debt Securities, Held-to-maturity, Maturity [Abstract]    
Held-to-maturity securities, amortized cost 283 535
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair value 283 $ 535
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held-to-maturity securities, debt maturities, within 1 year, fair value 251  
Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value 9  
Held-to-maturity securities, debt maturities, over 5 years, fair value $ 24  
[1] Primarily issued by a diverse group of corporations