Principles Of Consolidation And Other Matters (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Equity method gains (losses)	$ (4)	$ 18	$ 14	$ 17
Equity method investments	117		117
Remaining capital commitment	67		67
Effective tax rate	31.10%	67.40%	29.80%	14.90%
Total income taxes	(129)	60	(257)	(43)
Income loss from continuing operations before income taxes	(415)	89	(862)	(288)
Gross unrecognized tax benefits	152		152		199
Settlement agreement, recognized charge after insurance				400
Covered by Insurance [Member]
Settlement agreement				100
Excluding Tax Benefit [Member]
Effective tax rate	32.30%		31.40%	29.50%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible Estimated Range of Change Lower Limit [Member]
Projection of unrecognized tax benefit in twelve months, lower bound	0		0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible Estimated Range of Change Upper Limit [Member]
Projection of unrecognized tax benefit in twelve months, upper bound	20		20
Mercer [Member]
Settlement agreement				$ 500