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Provision for Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Income Taxes Information [Line Items] |  |
Exchange gain associated with hedging program | $ 434 | $ 607
Tax credit carryforward/back, net | 946 |
Tax effect of net carryforwards/backs, net of valuation allowances, not subject to expiration | 785 |
Unremitted earnings of subsidiaries outside the U.S. | 16,053 |
Expires After 2015 but before 2020 [Member] |  |
Income Taxes Information [Line Items] |  |
Tax credit carryforward/back, net | $ 7 |
Expiration date of net carryforwards/backs | before the end of 2020 |
Expires After 2020 [Member] |  |
Income Taxes Information [Line Items] |  |
Tax credit carryforward/back, net | $ 154 |
Expiration date of net carryforwards/backs | after 2020 |
Minimum [Member] |  |
Income Taxes Information [Line Items] |  |
Minimum amount of net reductions to company's global unrecognized tax benefit | $ 225 |
Maximum [Member] |  |
Income Taxes Information [Line Items] |  |
Minimum amount of net reductions to company's global unrecognized tax benefit | $ 250 |

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