Securities - Realized Gains and Losses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net gains on sales of AFS debt securities	$ 1,354	$ 1,271	$ 1,662
Debt securities
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross gains	1,366	1,302	2,128
Gross losses	(12)	(31)	(466)
Net gains on sales of AFS debt securities	1,354	1,271	1,662
Income tax expense attributable to realized net gains on sales of AFS debt securities	$ 515	$ 470	$ 615

Available-for-sale Securities, Income Tax Expense on Realized Gain (Loss) Excluding Other Than Temporary Impairments

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- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26805-111562

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities and excluding other than temporary impairments (OTTI), if any, recognized elsewhere.

+ References

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