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, 2009	$ 15,520	$ 55	$ 1,097	$ 6,608	$ 11,020	$ (4,268)	$ (2,092)	$ 3,100
Net income (loss)	392				254			138
Other comprehensive Income (loss)	751						417	334
Cash dividends declared:
Preferred @ $3.75 per share	(2)				(2)
Common @ $0.12 per share	(123)				(123)
Stock-based compensation (R)	84			84
Common stock issued: compensation plans (R)	(17)			(139)		122
Issuance of common stock (R)	600		44	556
Distributions	(256)							(256)
Contributions (M)	162							162
Purchase of equity from noncontrolling interest (P)	(6)			(2)				(4)
Other	(19)			(20)				1
Balance at Dec. 31, 2010	17,086	55	1,141	7,087	11,149	(4,146)	(1,675)	3,475
Net income (loss)	805				611			194
Other comprehensive Income (loss)	(1,181)						(952)	(229)
Cash dividends declared:
Preferred @ $3.75 per share	(2)				(2)
Common @ $0.12 per share	(129)				(129)
Stock-based compensation (R)	83			83
Common stock issued: compensation plans (R)	22			(172)		194
Issuance of common stock (R)	600		37	563
Distributions	(257)							(257)
Contributions (M)	169							169
Other	(1)							(1)
Balance at Dec. 31, 2011	17,195	55	1,178	7,561	11,629	(3,952)	(2,627)	3,351
Net income (loss)	162				191			(29)
Other comprehensive Income (loss)	(848)						(775)	(73)
Cash dividends declared:
Preferred @ $3.75 per share	(2)				(2)
Common @ $0.12 per share	(129)				(129)
Stock-based compensation (R)	67			67
Common stock issued: compensation plans (R)	3			(68)		71
Distributions	(95)							(95)
Contributions (M)	171							171
Other	(1)							(1)
Balance at Dec. 31, 2012	$ 16,523	$ 55	$ 1,178	$ 7,560	$ 11,689	$ (3,881)	$ (3,402)	$ 3,324