CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	RETAINED EARNINGS
Balance at Dec. 31, 2012		$ 626	$ 19,079	$ (1,701)	$ 1,285
Increase (Decrease) in Stockholders' Equity
Issuance of common stock through dividend reinvestment, incentive and benefit plans		2	50
Repurchase of common stock		(35)	(1,219)
Shares withheld to satisfy tax withholdings			(16)
Share-based compensation and other, net			60
Dividends declared			0		(980)
Other comprehensive income	41			41
Net income (loss)	(478)				(478)
Balance at Sep. 30, 2013	16,714	593	17,954	(1,660)	(173)
Balance at Dec. 31, 2013	17,191	584	17,343	(802)	66
Increase (Decrease) in Stockholders' Equity
Issuance of common stock through dividend reinvestment, incentive and benefit plans		4	43
Repurchase of common stock		(17)	(497)
Shares withheld to satisfy tax withholdings			(15)
Share-based compensation and other, net			63
Dividends declared			(405)		(519)
Other comprehensive income	13			13
Net income (loss)	584				584
Balance at Sep. 30, 2014	$ 16,445	$ 571	$ 16,532	$ (789)	$ 131