Securities - Gains and Losses on Sales of AFS Debt Securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net gains on sales of AFS debt securities	$ 490	$ 1,138	$ 1,481
Debt securities
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross gains	520	1,174	1,504
Gross losses	(30)	(36)	(23)
Net gains on sales of AFS debt securities	490	1,138	1,481
Income tax expense attributable to realized net gains on sales of AFS debt securities	$ 186	$ 432	$ 563

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 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=73527792&loc=d3e27357-111563

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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=66010992&loc=d3e26805-111562

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- Definition

Amount of loss realized on the sale of debt or equity securities classified as available-for-sale. Excludes other than temporary impairments (OTTI).

+ References

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