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Provision for Income Taxes (Reconciliation of Amounts of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Total unrecognized tax benefits as of January 1 | $ 846 | $ 986 | $ 901
Gross amounts of decreases in unrecognized tax benefits as a result of tax positions taken during the prior period | (41) | (98) | (50)
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken during the prior period | 32 | 13 | 84
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken during the current period | 55 | 69 | 92
Amount of decreases in the unrecognized tax benefits relating to settlements | (314) | (58) | (15)
Reduction to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations | (30) | (30) | (3)
Exchange loss (gain) | 2 | (36) | (23)
Total unrecognized tax benefits as of December 31 | 550 | 846 | 986
Total unrecognized tax benefits that, if recognized, would impact the effective tax rate | 429 | 651 | 818
Total amount of interest and penalties recognized in the Consolidated Income Statements | 20 | (8) | 5
Total amount of interest and penalties recognized in the Consolidated Balance Sheets | $ 98 | $ 105 | $ 117

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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