Note 9 - Commitments, Guarantees and Contingencies (Detail) - Environmental Matters (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Cost estimate range	$ 312
Cost estimate range	506
Amount recorded	328
Expected costs over next twelve months	39
Illinois [Member]
Cost estimate range	136
Cost estimate range	218
Amount recorded	136
Expected costs over next twelve months	21
Georgia And Florida [Member]
Cost estimate range	42
Cost estimate range	98
Amount recorded	57
Expected costs over next twelve months	7
New Jersey [Member]
Cost estimate range	124
Cost estimate range	174
Amount recorded	124
Expected costs over next twelve months	9
North Carolina [Member]
Cost estimate range	10
Cost estimate range	16
Amount recorded	11
Expected costs over next twelve months	$ 2