Note 10 - Segment Information (Detail) - Reconciliation of EBIT to Operating Income (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Operating income	$ 262	$ 238	$ 262	$ 238
Other income	4	1	4	1
EBIT	266	239	266	239
Interest expense	47	29	47	29
Earnings before income taxes	219	210	219	210
Income taxes	80	76	80	76
Net income	$ 139	$ 134	$ 139	$ 134