Stockholder's Equity (Tables)

3 Months Ended

Mar. 31, 2012

Stockholders' Equity [Abstract]

Earnings per Share

	Three Months Ended March 31, 2012	Three Months Ended March 31, 2011
	(in millions)
As reported shares	868	848
Effect of options and performance share award units	9	6
Diluted shares	877	854

Changes in Stockholders' Equity

	Number of Common Shares		Common Stockholders’	Preferred and Preference Stock of	Total     Stockholders’
	Issued	Treasury	Equity	Subsidiaries	Equity
	(in thousands)			(in millions)
Balance at December 31, 2011	865,664	(539)	$17,578	$707	$18,285
Net income after dividends on preferred and preference stock	—	—	368	—	368
Other comprehensive income (loss)	—	—	6	—	6
Stock issued	3,571	—	157	—	157
Cash dividends on common stock	—	—	(410)	—	(410)
Other	—	(6)	—	—	—
Balance at March 31, 2012	869,235	(545)	$17,699	$707	$18,406
Balance at December 31, 2010	843,814	(474)	$16,202	$707	$16,909
Net income after dividends on preferred and preference stock	—	—	422	—	422
Other comprehensive income (loss)	—	—	4	—	4
Stock issued	5,784	—	222	—	222
Cash dividends on common stock	—	—	(385)	—	(385)
Other	—	(1)	—	—	—
Balance at March 31, 2011	849,598	(475)	$16,465	$707	$17,172