Note 4 - Fair Value Measurements (Detail) - Reconciliation Retirement Plan Assets Level 3 (Fair Value, Inputs, Level 3 [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Assets:
Beginning balance	$ 89	$ 87
Ending balance	97	89
Gains included in changes in net assets	8	5
Purchases	15	6
Sales	(15)	(9)
Global Hedged Equity [Member]
Assets:
Beginning balance	30	35
Ending balance	38	30
Gains included in changes in net assets	3	(1)
Purchases	15	2
Sales	(10)	(6)
Absolute Return [Member]
Assets:
Beginning balance	34	30
Ending balance	36	34
Gains included in changes in net assets	2	1
Purchases	0	3
Sales	0	0
Private Capital [Member]
Assets:
Beginning balance	25	22
Ending balance	23	25
Gains included in changes in net assets	3	5
Purchases	0	1
Sales	$ (5)	$ (3)