Consolidated Statements of Changes in Equity (USD $) In Millions	Total	Common Stock	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Subtotal	Other	Preferred Stock and Preference Stock
Balance, at the beginning of the period at Dec. 31, 2008	$ 10,709	$ 2,272	$ 167	$ 7,078	$ 9,517	$ 285	$ 907
Net income (loss)	(945)	0		(849)	(849)	(45)	(51)
Other comprehensive income (loss)	(130)	0	(130)	0	(130)	0	0
Common stock dividends declared ($1.265, $1.245 and $1.225 per share for the year 2011, 2010, and 2009 respectively)	(406)	0	0	(406)	(406)	0	0
Dividends, distributions to noncontrolling interests and other	(123)	0	0	0	0	(72)	(51)
Stock-based compensation - net	(3)	9	0	(12)	(3)	0	0
Noncash stock-based compensation and other	14	23	0	(9)	14	0	0
Balance, at the end of the period at Dec. 31, 2009	11,006	2,304	37	7,500	9,841	258	907
Net income (loss)	(1,307)	0	0	(1,256)	(1,256)	1	(52)
Other comprehensive income (loss)	(113)	0	(113)	0	(113)	0	0
Deconsolidation of variable interest entities (See Note 3)	(249)	0	0	0	0	(249)	0
Cumulative effect of a change in accounting principle, net of tax	15	0	0	15	15	0	0
Common stock dividends declared ($1.265, $1.245 and $1.225 per share for the year 2011, 2010, and 2009 respectively)	(412)	0	0	(412)	(412)	0	0
Dividends, distributions to noncontrolling interests and other	(56)	0	0	0	0	(4)	(52)
Stock-based compensation - net	(16)	8	0	(24)	(16)	0	0
Noncash stock-based compensation and other	12	19	0	(7)	12	0	0
Balance, at the end of the period at Dec. 31, 2010	11,494	2,331	(76)	8,328	10,583	4	907
Net income (loss)	(21)	0	0	37	37	1	(59)
Other comprehensive income (loss)	(63)	0	(63)	0	(63)	0	0
Common stock dividends declared ($1.265, $1.245 and $1.225 per share for the year 2011, 2010, and 2009 respectively)	(419)	0	0	(419)	(419)	0	0
Dividends, distributions to noncontrolling interests and other	(60)	0	0	0	0	(1)	(59)
Stock Issued During Period, Value, Share-based Compensation and Other	(20)	14	0	(34)	(20)	0	0
Noncash stock-based compensation and other	25	30	0	(4)	26	0	(1)
Purchase of noncontrolling interests	(15)	(15)	0	0	(15)	0	0
Issuance of preference stock	123	0	0	0	0	0	123
Balance, at the end of the period at Dec. 31, 2011	$ 11,086	$ 2,360	$ (139)	$ 7,834	$ 10,055	$ 2	$ 1,029