Note 3 - Commitments, Contingencies, and Guarantees - Amount of the Asbestos Litigation Liability (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Amended PCC Plan [Member] | Equity Interests [Member]
Fair Value of Asbestos Litigation Liability	$ 238
Less: Contribution of PCC & PCE Equity Interests - Carrying Value	182
Gain on Contribution of Equity Interests	56
Asbestos Litigation Liability
Amended PCC Plan [Member] | Fixed Series of Payments [Member]
Fair Value of Asbestos Litigation Liability	290
Less: Contribution of PCC & PCE Equity Interests - Carrying Value
Gain on Contribution of Equity Interests
Asbestos Litigation Liability	290
Non-PCC Asbestos Litigation [Member]
Fair Value of Asbestos Litigation Liability	150
Less: Contribution of PCC & PCE Equity Interests - Carrying Value
Gain on Contribution of Equity Interests
Asbestos Litigation Liability	150
Amended PCC Plan and Non-PCC Asbestos Claims [Member]
Fair Value of Asbestos Litigation Liability	678
Less: Contribution of PCC & PCE Equity Interests - Carrying Value	182
Gain on Contribution of Equity Interests	56
Asbestos Litigation Liability	$ 440