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Derivatives and Hedging - Schedule of amounts of derivative gains (losses) recognized in the Consolidated Financial Statements (Details) - Designated as Hedging Instrument [Member] - Cash Flow Hedging [Member] - Foreign Exchange Contract [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |
Gain (loss) recognized in accumulated other comprehensive income | $ (9) | $ (2) | $ (4)
Gain (loss) reclassified from accumulated other comprehensive loss into income (effective portion) | (17) | (14) | (10)
Compensation and Benefits [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 4 | 11 | (17)
Gain (loss) reclassified from accumulated other comprehensive loss into income (effective portion) | 4 | (5) | (12)
Other General Expenses [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (3) | (3) | 0
Gain (loss) reclassified from accumulated other comprehensive loss into income (effective portion) | (1) | 3 | (9)
Interest Expense [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0
Gain (loss) reclassified from accumulated other comprehensive loss into income (effective portion) | (9) | (10) | (3)
Other Income [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (10) | (10) | 13
Gain (loss) reclassified from accumulated other comprehensive loss into income (effective portion) | $ (11) | $ (2) | $ 14

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
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