Note 2 - Significant Accounting Policies and Methods of Application (Details) - Other Income (Expense), Net (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Other Income (Expense), Net [Abstract]
Allowance for funds used during construction (AFUDC) - equity	$ 3		$ 2		$ 9		$ 4
Equity investment income (1)	3	[1]	2	[1]	8	[1]	10	[1]
Other, net	1		2		2		5
Total other income	$ 7		$ 6		$ 19		$ 19

[1] Primarily relates to our investment in Triton. See Note 8 for additional information.