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Financial Instruments - Derivative Financial Instruments and Hedging Activities - Footnotes (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |  |
Amount of pre-tax loss to be reclassified |  | $ 156 |
Carrying value of short-term borrowings | [1] | 8,831 | $ 9,953
Foreign currency short-term borrowings [Member] |  |  |
Derivative [Line Items] |  |  |
Carrying value of short-term borrowings |  | 1,400 |
Foreign currency long-term debt [Member] |  |  |
Derivative [Line Items] |  |  |
Principal amount |  | 3,200 |
Unsecured Debt [Member] |  |  |
Derivative [Line Items] |  |  |
Principal amount |  | $ 1,800 |
[1] | Amounts may not add due to rounding.

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