Discontinued Operations (Narrative) (Details) (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Partners Capital And Distributions [Line Items]
Gain on sale recorded as discontinued operations	$ 15,000,000	$ 15,000,000
Legal indemnification	256,000,000	256,000,000
Net impact of the indemnification to liabilities on the consolidated balance sheet	256,000,000	256,000,000
Fair value of the indemnification obligation	385,000,000	385,000,000
Morgan Keegan [Member]
Partners Capital And Distributions [Line Items]
Increase to purchase price in lieu of dividend from subsidiary		1,200,000,000
Net impact of the indemnification to liabilities on the consolidated balance sheet	$ 256,000,000	$ 256,000,000

Pretax gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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