Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

- Definition

This includes both the securitized and unsecuritized portion of the total principal amount.

+ References+ Details

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Goodwill, Intersegment Transfers			$ 0
change in amount of loans serviced for third parties			(7.00%)
Mortgage servicing related income	64,000,000	58,000,000	215,000,000	202,000,000
Goodwill, Impairment Loss			(7,000,000)
Mortgage Servicing Rights
Mortgage servicing related income	75,000,000	91,000,000	238,000,000	277,000,000
Total unpaid principal amount of mortgaged loans serviced	149,700,000,000		149,700,000,000		157,800,000,000
Included in these amounts of loans serviced for third parties	115,800,000,000		115,800,000,000		124,100,000,000
Residential mortgage loans sold			1,700,000,000
Consumer Banking and Private Wealth Management [Member]
Percentage of Fair Value in Excess of Carrying Value	21.00%		21.00%
RidgeWorth Capital Management [Member]
Percentage of Fair Value in Excess of Carrying Value	147.00%		147.00%
Wholesale Banking [Member]
Percentage of Fair Value in Excess of Carrying Value	31.00%		31.00%
GenSpring Family Offices, LLC [Member]
Goodwill, Impairment Loss	(7,000,000)		(7,000,000)
Retail Banking [Member]
Goodwill, Intersegment Transfers			(4,854,000,000)
Goodwill, Impairment Loss			0
Retail Banking [Member] \| Consumer Banking and Private Wealth Management Segment [Member]
Goodwill, Intersegment Transfers			3,600,000,000
Retail Banking [Member] \| Wholesale Banking [Member]
Goodwill, Intersegment Transfers			1,300,000,000
Wealth and Investment Management Segment [Member]
Goodwill, Intersegment Transfers			(382,000,000)
Goodwill, Impairment Loss			0
Wealth and Investment Management Segment [Member] \| Consumer Banking and Private Wealth Management Segment [Member]
Goodwill, Intersegment Transfers			335,000,000
Diversified Commercial Banking Reporting Unit [Member] \| Wholesale Banking [Member]
Goodwill, Intersegment Transfers			928,000,000
Corporate and Investment Banking Segment [Member]
Goodwill, Intersegment Transfers			(180,000,000)
Goodwill, Impairment Loss			0
Corporate and Investment Banking Segment [Member] \| Wholesale Banking [Member]
Goodwill, Intersegment Transfers			180,000,000
Wealth and Investment Management [Member] \| Wholesale Banking [Member]
Goodwill, Intersegment Transfers			47,000,000
Wholesale Banking [Member]
Goodwill, Intersegment Transfers			2,414,000,000
Goodwill, Impairment Loss			$ (7,000,000)