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Financial Instruments - Investments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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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.

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