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Financial Instruments - Investments (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Debt securities, amortized cost |  | $ 16,920 | $ 22,337
Debt securities, gross unrealized gains |  | 8 | 77
Debt securities, gross unrealized losses |  | (85) | (100)
Debt securities maturities, within 1 year, fair value |  | 16,293 |
Debt securities maturities, over 1 to 5 years, fair value |  | 512 |
Debt securities maturities, over 5 years, fair value |  | 38 |
Debt Securities, Available-for-sale and Held-to-maturity |  | 16,842 | 22,313
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 debt - non-U.S. [Member] |  |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |  |
Available-for-sale debt securities, amortized cost |  | 9,754 | 12,616
Available-for-sale debt securities, gross unrealized gain |  | 7 | 61
Available-for-sale debt securities, gross unrealized loss |  | (58) | (48)
Available-for-sale securities, debt maturities |  | 9,703 | 12,629
Available-for-sale Securities, Debt Maturities [Abstract] |  |  |
Available-for-sale securities, debt maturities, within 1 year, fair value |  | 9,609 |
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value |  | 94 |
Available-for-sale securities, debt maturities, over 5 years, fair value |  | 0 |
Available-for-sale securities, debt maturities |  | 9,703 | 12,629
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |  |
Held-to-maturity securities, debt maturities, total |  | 592 | 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 |  | 592 | 770
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Held-to-maturity securities, debt maturities, within 1 year, fair value |  | 592 |
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 |
Corporate and Other [Member] |  |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |  |
Available-for-sale debt securities, amortized cost | [2] | 5,905 | 7,859
Available-for-sale debt securities, gross unrealized gain | [2] | 0 | 15
Available-for-sale debt securities, gross unrealized loss | [2] | (27) | (52)
Available-for-sale securities, debt maturities | [2] | 5,878 | 7,823
Available-for-sale Securities, Debt Maturities [Abstract] |  |  |
Available-for-sale securities, debt maturities, within 1 year, fair value | [2] | 5,482 |
Available-for-sale securities, debt maturities, over 1 to 5 years, fair value | [2] | 394 |
Available-for-sale securities, debt maturities, over 5 years, fair value | [2] | 3 |
Available-for-sale securities, debt maturities | [2] | 5,878 | 7,823
Time deposits and other [Member] |  |  |
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |  |
Held-to-maturity securities, debt maturities, total |  | 668 | 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 |  | 668 | 1,091
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Held-to-maturity securities, debt maturities, within 1 year, fair value |  | 610 |
Held-to-maturity securities, debt maturities, over 1 to 5 years, fair value |  | 24 |
Held-to-maturity securities, debt maturities, over 5 years, fair value |  | $ 35 |
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] | Primarily issued by a diverse group of corporations.

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