Note 6 - Employee Benefit Plans (Detail) - Employee Benefit Plans (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
Service cost	$ 7	$ 3	$ 21	$ 10
Interest cost	10	7	32	21
Expected return on plan assets	(16)	(7)	(48)	(23)
Net amortization of prior service cost	(1)	(1)	(2)	(3)
Recognized actuarial loss	9	3	26	10
Net pension benefit cost	10	5	30	16
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	1	1	3	1
Interest cost	4	1	12	4
Expected return on plan assets	(1)	(1)	(4)	(4)
Net amortization of prior service cost	0	(1)	(1)	(2)
Recognized actuarial loss	2	0	7	1
Net pension benefit cost	$ 5	$ 0	$ 16	$ (1)