Reconciliation of Net Income/(Loss) to Net Income/(Loss) Available to Common Shareholders (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Net Income (Loss) Attributable to Parent	$ 399	$ 377	$ 804		$ 729
Dividends, Preferred Stock, Cash	(9)	(9)	(19)	[1]	(18)	[1]
Undistributed Earnings Allocated to Participating Securities	(3)	(3)	(5)		(6)
Net Income (Loss) Available to Common Stockholders, Basic	$ 387	$ 365	$ 780		$ 705
Average basic common shares	529,764,000	535,172,000	530,459,000		535,425,000
Stock options	1,000,000	2,000,000	2,000,000		2,000,000
Restricted stock	4,000,000	3,000,000	4,000,000		3,000,000
Average diluted common shares	535,486,000	539,763,000	536,234,000		539,812,000
Net income/(loss) per average common share - diluted	$ 0.72	$ 0.68	$ 1.45		$ 1.31
Earnings Per Share, Basic	$ 0.73	$ 0.68	$ 1.47		$ 1.32

[1] For the six months ended June 30, 2014, dividends were $2,022 per share for both Perpetual Preferred Stock Series A and B and $2,938 per share for Perpetual Preferred Stock Series E.For the six months ended June 30, 2013, dividends were $2,022 per share for both Perpetual Preferred Stock Series A and B and $2,856 per share for Perpetual Preferred Stock Series E.