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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] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | $ (14) | $ (3) | $ (1) | $ 4
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 4 | (7) | (16)
Interest rate contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0 | 0 | (1)
Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (14) | (3) | (1) | 4
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 4 | (7) | (15)
Compensation and Benefits [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (8) | (2) | (2) | 14
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 2 | (1) | 3 | (4)
Compensation and Benefits [Member] | Interest rate contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0 | 0 | 0
Compensation and Benefits [Member] | Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (8) | (2) | (2) | 14
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 2 | (1) | 3 | (4)
Other General Expenses [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (2) | (3) | (1) | (1)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 3 | (1) | 3
Other General Expenses [Member] | Interest rate contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0 | 0 | 0
Other General Expenses [Member] | Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (2) | (3) | (1) | (1)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 3 | (1) | 3
Interest Expense [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (2) | (3) | (6) | (9)
Interest Expense [Member] | Interest rate contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0 | 0 | (1)
Interest Expense [Member] | Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (2) | (3) | (6) | (8)
Other Income (Expense) [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (4) | 2 | 2 | (9)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 5 | (3) | (6)
Other Income (Expense) [Member] | Interest rate contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 0 | 0 | 0 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 0 | 0 | 0 | 0
Other Income (Expense) [Member] | Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | (4) | 2 | 2 | (9)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | $ 0 | $ 5 | $ (3) | $ (6)

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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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