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Other Income, Net (Schedule of Foreign Exchange Gain (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |
Net exchange (losses) gains | $ (106) | $ 30 | $ 196
Net exchange gains (losses), tax | (16) | (218) | (419)
Net exchange gains (losses), after-tax | (122) | (188) | (223)
Subsidiaries [Member] |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |
Net exchange (losses) gains | 198 | (404) | (411)
Net exchange gains (losses), tax | (126) | (61) | (207)
Net exchange gains (losses), after-tax | 72 | (465) | (618)
Hedging Program [Member] |  |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |  |
Net exchange (losses) gains | (304) | 434 | 607
Net exchange gains (losses), tax | 110 | (157) | (212)
Net exchange gains (losses), after-tax | $ (194) | $ 277 | $ 395

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- Definition Amount after tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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