Discontinued Operations - Operating Results of Discontinued Operations (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
		Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations before income tax			$ 42	$ (54)	$ (27)
Derivative, notional amount		$ 1,765	1,765	8,933
Fair value of derivative related liability		12	12	57
Commercial Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net interest income and other revenues			7	14	10
Income (loss) from discontinued operations before income tax			3	8	6
Card and Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net interest income and other revenues	[1]		44	0	0
Income (loss) from discontinued operations before income tax	[1],[2]		39	(62)	(33)
Incremental expenses for industry review				$ 41	$ 7
Incremental reduction in accrual for industry review			(9)
Visa Class B Shares [Member] | Card and Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of stock		44
HSBC USA, Inc. [Member] | Visa Class B Shares [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Derivative, notional amount		50	50
Fair value of derivative related liability		$ 5	$ 5

[1] For 2016, the amount includes a $44 million gain on sale of Visa Class B Shares as discussed more fully below.

[2] For 2015 and 2014, the amounts reflect an increase in our accrual of $41 million and $7 million, respectively, related to an industry review of credit card enhancement services products. During 2016, we reduced our accrual by $9 million related to this industry review. Additionally, the amounts for 2015 and 2014 include expenses related to activities to complete the separation of the credit card operational infrastructure between us and Capital One and in 2015, additional legal accruals.