Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net Income (Loss) Attributable to Parent	$ 405		$ 352
Dividends, Preferred Stock, Cash	(9)	[1]	(9)	[1]
Undistributed Earnings Allocated to Participating Securities	(3)		(3)
Net Income (Loss) Available to Common Stockholders, Basic	$ 393		$ 340
Average basic common shares	531		536
Stock options	2		1
Restricted stock	4		3
Average diluted common shares	537		540
Net income/(loss) per average common share - diluted	$ 0.73		$ 0.63
Earnings Per Share, Basic	$ 0.74		$ 0.64

[1] For the three months ended March 31, 2014, dividends were $1,000 per share for both Perpetual Preferred Stock Series A and B and $1,469 per share for Perpetual Preferred Stock Series E.For the three months ended March 31, 2013, dividends were $1,000 per share for both Perpetual Preferred Stock Series A and B and $1,387 per share for Perpetual Preferred Stock Series E.