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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 | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | $ 1 | $ (8) | $ 7 | $ (18)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (4) | (4) | 6 | (4)
Compensation and benefits |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 1 | 0 | 9 | (2)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0 | 13 | 1
Other General Expenses |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 1 | (2) | 2 | (5)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (1) | (1) | (2) | (1)
Interest Expense |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 0 | 0 | 0 | 0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (1) | (1) | (1) | (1)
Other Income (Expense) |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | (1) | (6) | (4) | (11)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | $ (2) | $ (2) | $ (4) | $ (3)

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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=84234895&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=84234895&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=84234895&loc=SL5624171-113959 + Details
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