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Financial Instruments - Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Debt securities, amortized cost $ 16,658 $ 22,337
Debt securities, gross unrealized gains 11 77
Debt securities, gross unrealized losses (160) (100)
Available-for-sale securities and held-to-maturity securities 16,509 22,313
Debt securities maturities, within 1 year, fair value 12,704  
Debt securities maturities, over 1 to 5 years, fair value 2,909  
Debt securities maturities, over 5 years, fair value 896  
Available-for-sale Equity Securities [Abstract]    
Available-for-sale equity securities, amortized cost [1]   2,843
Available-for-sale equity securities, gross unrealized gain [1]   586
Available-for-sale equity securities, gross unrealized losses [1]   (124)
Available-for-sale securities, equity securities [1]   3,304
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 8,476 12,616
Available-for-sale debt securities, gross unrealized gains 9 61
Available-for-sale debt securities, gross unrealized losses (43) (48)
Available-for-sale debt securities, fair value 8,442 12,629
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value 8,336  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value 106  
Available-for-sale securities, debt maturities, over 5 years, fair value 0  
Available-for-sale debt securities, fair value 8,442 12,629
Debt Securities, Held-to-maturity, Maturity [Abstract]    
Held-to-maturity securities, debt maturities, total 778 770
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair value 778 770
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held-to-maturity securities, debt maturities, within 1 year, fair value 778  
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 778 770
Corporate [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost [2] 6,192 6,955
Available-for-sale debt securities, gross unrealized gains [2] 2 15
Available-for-sale debt securities, gross unrealized losses [2] (94) (33)
Available-for-sale debt securities, fair value [2] 6,100 6,938
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value [2] 2,890  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value [2] 2,356  
Available-for-sale securities, debt maturities, over 5 years, fair value [2] 854  
Available-for-sale debt securities, fair value [2] 6,100 6,938
Government - U.S. [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost 451 765
Available-for-sale debt securities, gross unrealized gains 0 0
Available-for-sale debt securities, gross unrealized losses (23) (19)
Available-for-sale debt securities, fair value 428 747
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value 8  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value 421  
Available-for-sale securities, debt maturities, over 5 years, fair value 0  
Available-for-sale debt securities, fair value 428 747
Agency asset-backed - U.S. [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost 18 24
Available-for-sale debt securities, gross unrealized gains 0 0
Available-for-sale debt securities, gross unrealized losses (1) (1)
Available-for-sale debt securities, fair value 18 24
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value 17  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value 0  
Available-for-sale securities, debt maturities, over 5 years, fair value 0  
Available-for-sale debt securities, fair value 18 24
Other asset-backed [Member]    
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]    
Available-for-sale debt securities, amortized cost [3] 9 114
Available-for-sale debt securities, gross unrealized gains [3] 0 0
Available-for-sale debt securities, gross unrealized losses [3] 0 0
Available-for-sale debt securities, fair value [3] 9 114
Available-for-sale Securities, Debt Maturities [Abstract]    
Available-for-sale securities, debt maturities, within 1 year, fair value [3] 5  
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value [3] 3  
Available-for-sale securities, debt maturities, over 5 years, fair value [3] 2  
Available-for-sale debt securities, fair value [3] 9 114
Time deposits and other [Member]    
Debt Securities, Held-to-maturity, Maturity [Abstract]    
Held-to-maturity securities, debt maturities, total 734 1,091
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses 0 0
Held-to-maturity securities, fair value 734 1,091
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]    
Held-to-maturity securities, debt maturities, within 1 year, fair value 670  
Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value 23  
Held-to-maturity securities, debt maturities, over 5 years, fair value 40  
Held-to-maturity securities, debt maturities, total $ 734 1,091
Money market funds [Member]    
Available-for-sale Equity Securities [Abstract]    
Available-for-sale equity securities, amortized cost [1]   2,115
Available-for-sale equity securities, gross unrealized gain [1]   0
Available-for-sale equity securities, gross unrealized losses [1]   0
Available-for-sale securities, equity securities [1]   2,115
Equity [Member]    
Available-for-sale Equity Securities [Abstract]    
Available-for-sale equity securities, amortized cost [1]   728
Available-for-sale equity securities, gross unrealized gain [1]   586
Available-for-sale equity securities, gross unrealized losses [1]   (124)
Available-for-sale securities, equity securities [1]   $ 1,190
[1] Upon the 2018 adoption of a new accounting standard related to financial assets and liabilities, available-for-sale equity securities were classified as equity securities. For additional information see Note 1B.
[2] Issued by a diverse group of corporations.
[3] Includes mortgage-backed, loan-backed and receivable-backed securities, all of which are in senior positions in the capital structure of the security. Mortgage-backed securities are collateralized by diversified pools of residential and commercial mortgages. Loan-backed securities are collateralized by senior secured obligations of a diverse pool of companies or student loans. Receivable-backed securities are collateralized by credit cards receivables.