Condensed Statements Of Consolidated Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest income (Note 3)	$ 152	$ 160	$ 462	$ 463
Interest expense and related charges (Note 8)	(137)	(88)	(368)	(259)
Income before income taxes and equity in earnings of unconsolidated subsidiary	15	72	94	204
Income tax expense	(6)	(25)	(35)	(72)
Equity in earnings of unconsolidated subsidiary (net of tax) (Note 2)	109	113	249	235
Net income	$ 118	$ 160	$ 308	$ 367