Long-Term Debt and Capital - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Mar. 31, 2011	Jun. 30, 2011		Dec. 31, 2010
Common stock offerings	$ 1,000,000,000	$ 1,017,000,000
Senior notes, issuance interest rate	3.60%
Senior notes, due date	2016
Repurchase of Fixed Rate Cumulative Preferred Stock, series C		4,850,000,000
Repurchase of Series C & D preferred stock, accelerating the outstanding discount accretion		(74,000,000)
Long-Term Debt		13,693,000,000	[1]	13,648,000,000	[1]
Senior notes, issued		1,000,000,000
Subordinated debt matured		852,000,000
Floating rate euro denominated notes, repayment		220,000,000
Common stock offerings, increase in common equity		1,000,000,000
Transactions that decreased common equity		3,500,000,000
Common stock offerings, new common shares		35,000,000
Senior Notes
Senior debt offerings	1,000,000,000
Series C Preferred Stock
Repurchase of Fixed Rate Cumulative Preferred Stock, series C	3,500,000,000
Series D Preferred Stock
Repurchase of Fixed Rate Cumulative Preferred Stock, series C	1,400,000,000
Series C and Series D Preferred Stock
Repurchase of Series C & D preferred stock, accelerating the outstanding discount accretion	$ 74,000,000
Group 1
Warrant issued to purchase common stock, shares	11,891,280
Warrant issued, initial exercise price	44.15
Group 2
Warrant issued to purchase common stock, shares	6,008,902
Warrant issued, initial exercise price	33.70

[1] Includes debt of consolidated VIEs ($289 and $290 at fair value at June 30, 2011 and December 31, 2010, respectively) 743 764