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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, January 1 | $ 870 | $ 909 | $ 1,044
Increases: |  |  |
Current year tax positions | 167 | 81 | 4
Tax positions related to prior years | 117 | 177 | 111
Decreases: |  |  |
Tax positions related to prior years | (81) | (256) | (181)
Settlements with tax authorities | (76) | (15) | (67)
Lapse of statute of limitations | (22) | (26) | (1)
Effects of foreign currency translations | (1) | 0 | (1)
Balance, December 31 | $ 974 | $ 870 | $ 909

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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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