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Income Taxes Summary of Gross Unrecognized Income Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary of Gross Unrecognized Income Tax Benefits [Abstract] |  |  |
Balance at January 1 | $ 493 | $ 479 | $ 444
Increases and decreases as a result of positions taken during prior years |  |  |
Transfers from valuation allowances | 0 | (3) | 13
Other increases, including currency translation | 34 | 37 | 7
Other decreases, including currency translation | (34) | (3) | (7)
Balances related to acquired businesses | (1) | (3) | 2
Increases as a result of positions taken during the current year | 109 | 65 | 35
Decreases relating to settlements with tax authorities | 0 | (51) | (6)
Decreases as a result of a lapse of the applicable statute of limitations | (17) | (28) | (9)
Balance at December 31 | $ 584 | $ 493 | $ 479

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in 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) -URI http://asc.fasb.org/extlink&oid=6907707&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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