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Derivatives and Hedging - Schedule of amounts of derivative gains (losses) recognized in the Consolidated Financial Statements (Details) - Cash Flow Hedging [Member] - Foreign exchange contracts [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | $ (8) | $ 14 | $ (18) | $ 13
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (4) | 3 | (4) | (7)
Compensation and Benefits [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | 0 | 1 | (2) | 6
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 1 | 1 | 1
Other General Expenses [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | (2) | 3 | (5) | 1
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (1) | (1) | (1) | (1)
Interest Expense [Member] |  |  |  |
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) | (2) | (1) | (4)
Other Income (Expense) [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Accumulated Other Comprehensive Loss: | (6) | 10 | (11) | 6
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | $ (2) | $ 5 | $ (3) | $ (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=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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