Note 6 - Employee Benefit Plans (Detail) - Employee Benefit Plans (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Plans, Defined Benefit [Member]
Service cost	$ 7	$ 4	$ 14	$ 7
Interest cost	11	7	22	14
Expected return on plan assets	(16)	(8)	(32)	(16)
Net amortization of prior service cost	0	0	(1)	(1)
Recognized actuarial loss	8	3	17	7
Net pension benefit cost	10	6	20	11
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	1	0	2	0
Interest cost	4	2	8	3
Expected return on plan assets	(2)	(2)	(3)	(3)
Net amortization of prior service cost	0	(1)	(1)	(2)
Recognized actuarial loss	2	0	5	1
Net pension benefit cost	$ 5	$ (1)	$ 11	$ (1)