Fair Value Disclosures (Gains (Losses) Due to Changes in Instrument Specific Credit Risk) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Short-term and Long-term Borrowings
Fair Value disclosure
Gains (losses) due to changes in instrument specific credit risk	$ 435	$ 215	$ 742	$ 428
Loans and other debt
Fair Value disclosure
Gains (losses) due to changes in instrument specific credit risk	(32)	25	39	153
Lending Commitments
Fair Value disclosure
Gains (losses) due to changes in instrument specific credit risk	$ 5	$ 2	$ 13	$ 29

This item represents the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk of liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Name:	us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration