Note 7 - Equity (Details) - Reclassifications Out of Accumulated Other Comprehensive Loss (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Cash flow hedges
Interest rate contracts	$ 43		$ 45	$ 135		$ 137
Income tax benefit	18		6	145		106
Net of tax	28		9	231		173
Retirement benefit plan amortization of
Total before income tax	46		15	387		289
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Natural Gas Derivatives [Member]
Cash flow hedges
Natural gas contracts	(1)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Rate Contract [Member]
Cash flow hedges
Interest rate contracts	1			(3)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Cash flow hedges
Income tax benefit				1
Net of tax				(2)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Cash flow hedges
Income tax benefit	3			7
Net of tax	(1)	[1]		(8)	[1]
Retirement benefit plan amortization of
Actuarial losses	(6)	[1],[2]		(19)	[1],[2]
Prior service credits	2	[1],[2]		4	[1],[2]
Total before income tax	(4)	[1]		(15)	[1]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Cash flow hedges
Net of tax	$ (1)	[1]		$ (10)	[1]

[1] Amounts in parentheses indicate debits, or reductions, to profit/loss and credits to accumulated other comprehensive loss. Except for retirement benefit plan amounts, the profit/loss impacts are immediate.

[2] Amortization of these accumulated other comprehensive loss components is included in the computation of net periodic benefit cost. See Note 5 for additional details about net periodic benefit cost.