CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions, unless otherwise specified	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	ACCUMULATED OTHER COMPREHENSIVE LOSS	RETAINED EARNINGS
Balance at beginning of period at Dec. 31, 2011		$ 619	$ 18,901	$ (1,012)	$ 2,319
Increase (Decrease) in Stockholders' Equity
Issuance of common stock through dividend reinvestment, incentive and benefit plans		8	102
Repurchase of common stock		0	0
Shares withheld to satisfy tax withholdings		(1)	(34)
Share-based compensation and other, net			(110)
Other comprehensive (loss) income	(689)			(689)
Net income (loss)	777				777
Dividends declared			0		(1,811)
Balance at end of period at Dec. 31, 2012	19,289	626	19,079	(1,701)	1,285
Increase (Decrease) in Stockholders' Equity
Issuance of common stock through dividend reinvestment, incentive and benefit plans		4	69
Repurchase of common stock		46	1,551
Shares withheld to satisfy tax withholdings		0	(18)
Share-based compensation and other, net			(85)
Other comprehensive (loss) income	899			899
Net income (loss)	(239)				(239)
Dividends declared			(321)		(980)
Balance at end of period 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	46
Repurchase of common stock		19	591
Shares withheld to satisfy tax withholdings		0	(16)
Share-based compensation and other, net			(82)
Other comprehensive (loss) income	(1,215)			(1,215)
Net income (loss)	772				772
Dividends declared			(540)		(691)
Balance at end of period at Dec. 31, 2014	$ 15,023	$ 569	$ 16,324	$ (2,017)	$ 147