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Financial Instruments - Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Debt securities, amortized cost $ 7,023 $ 16,920
Debt securities, gross unrealized gains 10 8
Debt securities, gross unrealized losses (19) (85)
Available-for-sale securities and held-to-maturity securities 7,014 16,842
Debt securities maturities, within 1 year, fair value 6,537  
Debt securities maturities, over 1 to 5 years, fair value 437  
Debt securities maturities, over 5 years, fair value 40  
Government and agency - non U.S. [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost 3,056 9,754
Available-for-sale debt securities, gross unrealized gains 9 7
Available-for-sale debt securities, gross unrealized losses (7) (58)
Available-for-sale debt securities, fair value 3,059 9,703
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value 3,014  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value 45  
Available-for-sale securities, debt maturities, over 5 years, fair value 0  
Available-for-sale debt securities, fair value 3,059 9,703
Debt Securities, Held-to-maturity, Maturity [Abstract]    
Held-to-maturity securities, debt maturities, total 865 592
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair value 865 592
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held-to-maturity securities, debt maturities, within 1 year, fair value 864  
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 0  
Held-to-maturity securities, debt maturities, total 865 592
Corporate [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost [1] 2,409 5,905
Available-for-sale debt securities, gross unrealized gains [1] 1 0
Available-for-sale debt securities, gross unrealized losses [1] (12) (27)
Available-for-sale debt securities, fair value [1] 2,398 5,878
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value [1] 2,013  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value [1] 382  
Available-for-sale securities, debt maturities, over 5 years, fair value [1] 3  
Available-for-sale debt securities, fair value [1] 2,398 5,878
Time deposits and other [Member]    
Debt Securities, Held-to-maturity, Maturity [Abstract]    
Held-to-maturity securities, debt maturities, total 693 668
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair value 693 668
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held-to-maturity securities, debt maturities, within 1 year, fair value 646  
Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value 10  
Held-to-maturity securities, debt maturities, over 5 years, fair value 37  
Held-to-maturity securities, debt maturities, total $ 693 $ 668
[1]
Primarily issued by a diverse group of corporations.