Principles Of Consolidation And Other Matters (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	Dec. 31, 2011
Equity method gains (losses)	$ (1)	$ 0	$ 23	$ 14
Equity method investments	66		66
Remaining capital commitment	67		67
Effective tax rate	26.80%	32.80%	29.20%	30.40%
Gross unrecognized tax benefits	143		143		143
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	94		94		102
Minimum [Member] | Significant Change in Unrecognized Tax Benefits is Reasonably Possible Estimated Range of Change Upper Limit [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	0		0
Maximum [Member] | 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