Restatement Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss) Attributable to Parent	$ 13	$ 60	$ 8	$ 594
Change in payables and accruals			778	(141)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		0	533	0
Net Cash Provided by (Used in) Operating Activities, Continuing Operations			2,212
Scenario, Previously Reported [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss) Attributable to Parent	401	0	396	535
Change in payables and accruals			(118)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	0		0
Net Cash Provided by (Used in) Operating Activities, Continuing Operations			2,212
Restatement Adjustment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Income (Loss) Attributable to Parent	(388)	60	(388)	59
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	533		533
Net Cash Provided by (Used in) Operating Activities, Continuing Operations			$ 0