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Provision for Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Income Taxes Information [Line Items] |  |
Net exchange (loss) gain associated with hedging program | $ (304) | $ 434
Tax credit carryforward/back, net | 516 |
Tax effect of net carryforwards/backs, net of valuation allowances, not subject to expiration | 285 |
Unremitted earnings of subsidiaries outside the U.S. | 17,380 |
Expires After 2016 but before 2021 [Member] |  |
Income Taxes Information [Line Items] |  |
Tax credit carryforward/back, net | $ 3 |
Expiration date of net carryforwards/backs | before the end of 2021 |
Expires After 2021 [Member] |  |
Income Taxes Information [Line Items] |  |
Tax credit carryforward/back, net | $ 228 |
Expiration date of net carryforwards/backs | after 2021 |
Minimum [Member] |  |
Income Taxes Information [Line Items] |  |
Minimum amount of net reductions to company's global unrecognized tax benefit | $ 70 |
Maximum [Member] |  |
Income Taxes Information [Line Items] |  |
Minimum amount of net reductions to company's global unrecognized tax benefit | $ 90 |

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