Statement of Changes in Consolidated Equity (USD $) In Millions, unless otherwise specified	Total	Preferred Stock [Member]	Mandatory Convertible 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 Jun. 30, 2013	$ 15,858	$ 55		$ 1,178	$ 7,524	$ 11,653	$ (3,812)	$ (3,783)	$ 3,043
Net income (loss)	44					24			20
Other comprehensive income (loss)	40							69	(29)
Cash dividends declared:
Preferred share, value	(1)					(1)
Common share, value	(65)					(65)
Stock-based compensation	13				13
Common stock issued: compensation plans	1				(1)		2
Distributions	(27)								(27)
Other	1								1
Balance at Sep. 30, 2013	15,864	55		1,178	7,536	11,611	(3,810)	(3,714)	3,008
Balance at Dec. 31, 2012	16,523	55		1,178	7,560	11,689	(3,881)	(3,402)	3,324
Net income (loss)	66					54			12
Other comprehensive income (loss)	(571)							(312)	(259)
Cash dividends declared:
Preferred share, value	(2)					(2)
Common share, value	(130)					(130)
Stock-based compensation	59				59
Common stock issued: compensation plans	(12)				(83)		71
Issuance of mandatory convertible preferred stock (K)	0
Distributions	(80)								(80)
Contributions	12								12
Other	(1)								(1)
Balance at Sep. 30, 2013	15,864	55		1,178	7,536	11,611	(3,810)	(3,714)	3,008
Balance at Dec. 31, 2013	13,522	55		1,178	7,509	9,272	(3,762)	(3,659)	2,929
Net income (loss)	63					109			(46)
Other comprehensive income (loss)	(261)							(177)	(84)
Cash dividends declared:
Preferred share, value	(1)					(1)
Common share, value	(104)					(104)
Stock-based compensation	71				71
Common stock issued: compensation plans	114				(519)		633
Issuance of mandatory convertible preferred stock (K)	1,213		3		1,210
Issuance of common stock (G)	575			89	486
Distributions	(75)								(75)
Contributions	44								44
Purchase of equity from noncontrolling interest (E)	(28)				3				(31)
Other	2								2
Balance at Sep. 30, 2014	15,135	55	3	1,267	8,760	9,276	(3,129)	(3,836)	2,739
Balance at Jun. 30, 2014	14,706	55		1,267	7,635	9,163	(3,275)	(3,168)	3,029
Net income (loss)	131					149			(18)
Other comprehensive income (loss)	(893)							(668)	(225)
Cash dividends declared:
Common share, value	(36)					(36)
Stock-based compensation	22				22
Common stock issued: compensation plans	36				(110)		146
Issuance of mandatory convertible preferred stock (K)	1,213		3		1,210
Distributions	(20)								(20)
Purchase of equity from noncontrolling interest (E)	(28)				3				(31)
Other	4								4
Balance at Sep. 30, 2014	$ 15,135	$ 55	$ 3		$ 8,760	$ 9,276	$ (3,129)	$ (3,836)	$ 2,739