Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	Total	Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning balance at Dec. 31, 2008	$ 15,620	$ 15,620	$ 6	$ 7,190	$ (6,884)	$ 15,484	$ (176)	$ 0
Increase (Decrease) in Equity Roll Forward
Net income (loss)	(1,982)	(1,982)	0	0	0	(1,982)	0	0
Dividends on common stock	(324)	(324)	0	0	0	(324)	0	0
Sale of common stock	799	799	1	798	0	0	0	0
Stock-based compensation expense	68	68	0	68	0	0	0	0
Tax deduction in excess of (less than) stock-based compensation expense	(4)	(4)	0	(4)	0	0	0	0
Transactions in connection with stock-based compensation plans:
Stock issuances	11	11	0	(156)	167	0	0	0
Stock repurchases	(4)	(4)	0	0	(4)	0	0	0
Other comprehensive income (loss)	541	541	0	0	0	0	541	0
Ending balance at Dec. 31, 2009	14,725	14,725	7	7,896	(6,721)	13,178	365	0
Increase (Decrease) in Equity Roll Forward
Net income (loss)	324	324	0	0	0	324	0	0
Dividends on common stock	(114)	(114)	0	0	0	(114)	0	0
Stock-based compensation expense	54	54	0	54	0	0	0	0
Tax deduction in excess of (less than) stock-based compensation expense	6	6	0	6	0	0	0	0
Transactions in connection with stock-based compensation plans:
Stock issuances	20	20	0	(252)	272	0	0	0
Stock repurchases	(13)	(13)	0	0	(13)	0	0	0
Other comprehensive income (loss)	23	23	0	0	0	0	23	0
Ending balance at Dec. 31, 2010	15,025	15,025	7	7,704	(6,462)	13,388	388	0
Increase (Decrease) in Equity Roll Forward
Net income (loss)	2,089	2,090	0	0	0	2,090	0	(1)
Dividends on common stock	(169)	(169)	0	0	0	(169)	0	0
Stock-based compensation expense	57	57	0	57	0	0	0	0
Tax deduction in excess of (less than) stock-based compensation expense	22	22	0	22	0	0	0	0
Transactions in connection with stock-based compensation plans:
Stock issuances	49	49	0	(287)	336	0	0	0
Stock repurchases	(359)	(359)	0	(10)	(349)	0	0	0
Contributions from noncontrolling interest in DGD	23	0	0	0	0	0	0	23
Recognition of noncontrolling interests in MLP in connection with Pembroke Acquisition	5	0	0	0	0	0	0	5
Acquisition of noncontrolling interests in MLP	(5)	0	0	0	0	0	0	(5)
Other comprehensive income (loss)	(292)	(292)	0	0	0	0	(292)	0
Ending balance at Dec. 31, 2011	$ 16,445	$ 16,423	$ 7	$ 7,486	$ (6,475)	$ 15,309	$ 96	$ 22