Goodwill And Other Intangible Assets (Intangible Assets Subject To Amortization) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012 Y		Dec. 31, 2011 Y		Jan. 07, 2011
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	$ 2,156		$ 1,799
Accumulated Amortization	(1,250)		(1,188)
Currency valuation Adjustments	1		(1)
Net Carrying Amount	907		610
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	1,771	[1]	1,562	[1]
Accumulated Amortization	(1,129)	[1]	(1,083)	[1]
Currency valuation Adjustments	0	[1]	0	[1]
Net Carrying Amount	642	[1],[2]	479	[1],[2]
Remaining Amortization Period, in years	5.1	[1]	5.9	[1]
Purchased Credit Card Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	77	[3]	77	[3]
Accumulated Amortization	(30)	[3]	(25)	[3]
Currency valuation Adjustments	0	[3]	0	[3]
Net Carrying Amount	47	[3]	52	[3]
Remaining Amortization Period, in years	5.0	[3]	5.2	[3]
Contract Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	70	[4]	70	[4]	70
Accumulated Amortization	(24)	[4]	(19)	[4]
Currency valuation Adjustments	1	[4]	(1)	[4]
Net Carrying Amount	47	[4],[5]	50	[4],[5]
Remaining Amortization Period, in years	5.8	[4]	6.0	[4]
Lease Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	54		54
Accumulated Amortization	(34)		(33)
Currency valuation Adjustments	0		0
Net Carrying Amount	20		21
Remaining Amortization Period, in years	20.2		20.7
Trust Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	11		11
Accumulated Amortization	(7)		(6)
Currency valuation Adjustments	0		0
Net Carrying Amount	4		5
Remaining Amortization Period, in years	11.7		11.9
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount of Assets	173	[6]	25
Accumulated Amortization	(26)	[6]	(22)
Currency valuation Adjustments	0	[6]	0
Net Carrying Amount	147	[6]	3
Remaining Amortization Period, in years	0.3	[6]	2.3
ING Direct [Member] | Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	202
Non-Compete Intangibles [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	16
Brokerage Relations Intangibles [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	81
Trade Mark/Name Intangibles [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 46

[1] Includes core deposit intangibles with a net carrying value of $202 million related to the acquisition of ING Direct in the first quarter of 2012.

[2] Includes core deposit intangibles with net carrying value of $202 million related to the acquisition of ING Direct in the first quarter of 2012.

[3] Relates to the acquisitions of the HBC credit card portfolio in the first quarter of 2011 and the Kohl's private-label credit card portfolio in the second quarter of 2011.

[4] Relates to the acquisition of the existing HBC credit card portfolio in the first quarter of 2011.

[5] Relates to the acquisition of the HBC portfolio in the first quarter of 2011.

[6] Includes brokerage relations intangibles with a net carrying value of $81 million, trade mark/name intangibles with a net carrying value of $46 million, and non-compete intangibles with a net carrying value of $16 million, all of which related to the acquisitions of ING Direct in the first quarter of 2012.