Income Taxes (Schedule Of Statutory Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Income tax expense, computed at the statutory rate of 35%		$ 863	$ 774	$ 641
State income tax, net of federal income tax effect		50	82	98
Tax differential on foreign earnings		(44)	(22)	(16)
Goodwill impairment charges	500		175	130
AFUDC equity income		(91)	(82)	(53)
Other items, net		(26)	(37)	(42)
Total income tax expense from continuing operations		$ 752	$ 890	$ 758
Effective tax rate		30.50%	40.30%	41.40%