Derivative Instruments and Other Financial Instruments Used For Hedging (Details 5) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial Assets
Gross Amounts of Recognized Assets, Derivative assets	$ 2,086	$ 1,799
Gross Amounts Offset in Balance Sheet, Derivative assets	1,025	887
Net Amounts Presented in Balance Sheet, Derivative assets	1,061us-gaap_DerivativeAssets	912us-gaap_DerivativeAssets
Gross Amounts Not Offset In Balance Sheet, Financial Instruments, Derivative assets	115	113
Net Amount, Derivative assets	946	799
Gross Amounts of Recognized Assets, Securities purchased under resale agreements	88	62
Net Amounts Presented in Balance Sheet, Securities purchased under resale agreements	88	62
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Securities purchased under repurchase agreements	86	61
Net Amount, Securities purchased under repurchase agreements	2	1
Gross Amounts of Recognized Assets, Financial Assets	2,174	1,861
Gross Amounts Offset in Balance Sheet, Financial Assets	1,025	887
Net Amounts Presented in Balance Sheet, Financial Assets	1,149	974
Gross Amounts Not Offset In Balance Sheet, Financial Instruments, Financial Assets	201	174
Net Amount, Financial Assets	948	800
Financial Liabilities
Gross Amounts of Recognized Liabilities, Derivative liabilities	1,844	1,624
Gross Amounts Offset in Balance Sheet, Derivative liabilities	957	787
Net Amounts Presented in Balance Sheet, Derivative liabilities	887us-gaap_DerivativeLiabilities	837us-gaap_DerivativeLiabilities
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Derivative liabilities	207	162
Net Amount, Derivative liabilities	680	675
Gross Amounts of Recognized Liabilities, Securities sold under repurchase agreements	54	68
Net Amounts Presented in Balance Sheet, Securities sold under repurchase agreements	54	68
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Securities sold under repurchase agreements	54	68
Gross Amounts of Recognized Liabilities, Financial Liabilities	1,898	1,692
Gross Amounts Offset in Balance Sheet, Financial Liabilities	957	787
Net Amounts Presented in Balance Sheet, Financial Liabilities	941	905
Gross Amount Not Offset in Balance Sheet, Financial Instruments, Financial Liabilities	261	230
Net Amount, Financial Liabilities	$ 680	$ 675

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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing

-URI http://asc.fasb.org/extlink&oid=49203159

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant