Stockholder's Equity (Tables)

6 Months Ended

Jun. 30, 2012

Stockholders' Equity [Abstract]

Earnings per Share

	Three Months Ended June 30, 2012	Three Months Ended June 30, 2011	Six Months Ended June 30, 2012	Six Months Ended June 30, 2011
	(in millions)
As reported shares	872	855	870	851
Effect of options and performance share award units	8	7	9	7
Diluted shares	880	862	879	858

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	—	—	991	—	991
Other comprehensive income (loss)	—	—	(1)	—	(1)
Stock issued	9,697	—	395	—	395
Cash dividends on common stock	—	—	(837)	—	(837)
Other	—	(26)	(2)	—	(2)
Balance at June 30, 2012	875,361	(565)	$18,124	$707	$18,831
Balance at December 31, 2010	843,814	(474)	$16,202	$707	$16,909
Net income after dividends on preferred and preference stock	—	—	1,026	—	1,026
Other comprehensive income (loss)	—	—	8	—	8
Stock issued	14,337	—	533	—	533
Cash dividends on common stock	—	—	(787)	—	(787)
Other	—	(25)	—	—	—
Balance at June 30, 2011	858,151	(499)	$16,982	$707	$17,689