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
Balance at Jun. 30, 2011	$ 19,369	$ 55	$ 1,178	$ 7,522	$ 11,714	$ (3,959)	$ (858)	$ 3,717
Net income	225				172			53
Other comprehensive income	(1,215)						(867)	(348)
Cash dividends declared:
Preferred @ $1.875 per share	(1)				(1)
Common @ $0.06 per share	(65)				(65)
Stock-based compensation	25			25
Common stock issued: compensation plans	3			(2)		5
Distributions	(66)							(66)
Contributions	8							8
Balance at Sep. 30, 2011	18,283	55		7,545	11,820	(3,954)	(1,725)	3,364
Balance at Dec. 31, 2010	17,086	55	1,141	7,087	11,149	(4,146)	(1,675)	3,475
Net income	968				802			166
Other comprehensive income	(209)						(50)	(159)
Cash dividends declared:
Preferred @ $1.875 per share	(2)				(2)
Common @ $0.06 per share	(129)				(129)
Stock-based compensation	70			70
Common stock issued: compensation plans	17			(175)		192
Issuance of common stock	600		37	563
Distributions	(253)							(253)
Contributions	136							136
Other	(1)							(1)
Balance at Sep. 30, 2011	18,283	55	1,178	7,545	11,820	(3,954)	(1,725)	3,364
Balance at Dec. 31, 2011	17,195	55	1,178	7,561	11,629	(3,952)	(2,627)	3,351
Net income	(95)				(51)			(44)
Other comprehensive income	(234)						(150)	(84)
Cash dividends declared:
Preferred @ $1.875 per share	(2)				(2)
Common @ $0.06 per share	(129)				(129)
Stock-based compensation	54			54
Common stock issued: compensation plans	4			(66)		70
Distributions	(71)							(71)
Contributions	132							132
Balance at Sep. 30, 2012	16,854	55	1,178	7,549	11,447	(3,882)	(2,777)	3,284
Balance at Jun. 30, 2012	16,914	55	1,178	7,538	11,655	(3,890)	(2,878)	3,256
Net income	(175)				(143)			(32)
Other comprehensive income	139						101	38
Cash dividends declared:
Preferred @ $1.875 per share	(1)				(1)
Common @ $0.06 per share	(64)				(64)
Stock-based compensation	15			15
Common stock issued: compensation plans	4			(4)		8
Contributions	22							22
Balance at Sep. 30, 2012	$ 16,854	$ 55	$ 1,178	$ 7,549	$ 11,447	$ (3,882)	$ (2,777)	$ 3,284