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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | $ 14 | $ 15 | $ 13 | $ 7
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 3 | 2 | (8) | (20)
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 | (1) | (1)
Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 14 | 15 | 13 | 7
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 3 | 2 | (7) | (19)
Compensation and Benefits [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 1 | 5 | 6 | 16
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 1 | 0 | 1 | (2)
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 | 1 | 5 | 6 | 16
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 1 | 0 | 1 | (2)
Other General Expenses [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 3 | 0 | 1 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (1) | 0 | (1) | 0
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 | 3 | 0 | 1 | 0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | (1) | 0 | (1) | 0
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) | (5) | (6)
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 | (1) | (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) | (4) | (5)
Other Income [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 10 | 10 | 6 | (9)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | 5 | 5 | (3) | (12)
Other Income [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 [Member] | Foreign exchange contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) recognized in accumulated other comprehensive income | 10 | 10 | 6 | (9)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion): | $ 5 | $ 5 | $ (3) | $ (12)

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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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