Statement of Changes in Consolidated Equity (USD $) In Millions, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2012	$ 16,523	$ 55	$ 1,178	$ 7,560	$ 11,689	$ (3,881)	$ (3,402)	$ 3,324
Net (loss) income	170				149			21
Other comprehensive income	112						93	19
Cash dividends declared:
Preferred @ $0.9375 per share	(1)				(1)
Common @ $0.03 per share	(32)				(32)
Stock-based compensation	23			23
Common stock issued: compensation plans	(10)			(75)		65
Distributions	(25)							(25)
Contributions	15							15
Other	(1)							(1)
Balance at Mar. 31, 2013	16,774	55	1,178	7,508	11,805	(3,816)	(3,309)	3,353
Balance at Dec. 31, 2013	13,522	55	1,178	7,509	9,272	(3,762)	(3,659)	2,929
Net (loss) income	(197)				(178)			(19)
Other comprehensive income	447						358	89
Cash dividends declared:
Preferred @ $0.9375 per share	(1)				(1)
Common @ $0.03 per share	(32)				(32)
Stock-based compensation	25			25
Common stock issued: compensation plans	51			(316)		367
Issuance of common stock	575		89	486
Distributions	(35)							(35)
Contributions	20							20
Other	(1)							(1)
Balance at Mar. 31, 2014	$ 14,374	$ 55	$ 1,267	$ 7,704	$ 9,061	$ (3,395)	$ (3,301)	$ 2,983