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Derivatives and Hedging - Schedule of amounts of derivative gains (losses) recognized in the Consolidated Financial Statements (Details) - Cash Flow Hedging - Foreign exchange contracts - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Derivative [Line Items] |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | $ 6 | $ (10)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 10 | 0
Compensation and benefits |  |
Derivative [Line Items] |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 8 | (2)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 13 | 1
Other General Expenses |  |
Derivative [Line Items] |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 1 | (3)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (1) | 0
Interest Expense |  |
Derivative [Line Items] |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 0 | 0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0
Other Income (Expense) |  |
Derivative [Line Items] |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | (3) | (5)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | $ (2) | $ (1)

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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=64837297&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=64837297&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=64837297&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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