Note 6 - Employee Benefit Plans (Detail) - Employee Benefit Plans (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Pension Plans, Defined Benefit [Member]
Service cost	$ 7	$ 3
Interest cost	11	7
Expected return on plan assets	(16)	(8)
Net amortization of prior service cost	(1)	(1)
Recognized actuarial loss	9	4
Net pension benefit cost	10	5
Net benefit cost	10	5
Service cost	7	3
Interest cost	11	7
Expected return on plan assets	(16)	(8)
Net amortization of prior service cost	(1)	(1)
Recognized actuarial loss	9	4
Net pension benefit cost	10	5
Net benefit cost	10	5
Other Postretirement Benefit Plans, Defined Benefit [Member]
Service cost	1	0
Interest cost	4	1
Expected return on plan assets	(1)	(1)
Net amortization of prior service cost	(1)	(1)
Recognized actuarial loss	3	1
Net pension benefit cost	6	0
Net benefit cost	6	0
Service cost	1	0
Interest cost	4	1
Expected return on plan assets	(1)	(1)
Net amortization of prior service cost	(1)	(1)
Recognized actuarial loss	3	1
Net pension benefit cost	6	0
Net benefit cost	$ 6	$ 0