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Other Income, Net (Schedule of Foreign Exchange Gain (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Foreign Currency Exchange Gain (Loss) [Line Items] |  |
Net exchange (losses) gains | $ (59) | $ (121)
Net exchange (losses) gains, tax | 66 | 68
Net exchange (losses) gains, after-tax | 7 | (53)
Subsidiary Monetary Position Gain (Loss) [Member] |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |
Net exchange (losses) gains | 26 | 33
Net exchange (losses) gains, tax | 36 | 13
Net exchange (losses) gains, after-tax | 62 | 46
Hedging Program Gain (Loss) [Member] |  |
Foreign Currency Exchange Gain (Loss) [Line Items] |  |
Net exchange (losses) gains | (85) | (154)
Net exchange (losses) gains, tax | 30 | 55
Net exchange (losses) gains, after-tax | $ (55) | $ (99)

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- Definition Tax effect on foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References No definition available. + Details
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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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