Acquisitions (Schedule Of Impact Of Acquired Company And Pro Forma Information On Our Results Of Operations) (Details) (b) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Business Acquisition [Line Items]
Income (loss) from continuing operations, net of tax, Actual	$ 1,505		$ 1,032
Revenue, Pro-Forma	5,151	[1]	5,280	[1],[2]
Income (loss) from continuing operations, net of tax, Pro-Forma	948		1,104	[2]
ING Direct Bancorporation [Member]
Business Acquisition [Line Items]
Revenue, Actual	237	[1],[3]
Income (loss) from continuing operations, net of tax, Actual	$ 37	[3]

[1] Consists of net interest income and non-interest income.

[2] Reflects the combined pro forma results of operations of ING Direct and Capital One assuming the acquisition had occurred on January 1, 2011.

[3] Reflects the approximate half-quarter impact of ING Direct on our results of operations in the first quarter of 2012.