Note 16 - Accumulated Other Comprehensive Income (Details) - Reclassifications Out of Accumulated Other Comprehensive Income by Component (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before tax	$ 829		$ 574		$ 1,357		$ 1,166
Provision for income taxes	(191)		(100)		(225)		(218)
Net income	638	[1]	474	[1]	1,132	[1]	948	[1]
Realized gains on designated hedges	(1,099)		(1,100)		(2,143)		(2,196)
Realized gains on investments	265		8		330		37
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net actuarial loss	(4)	[2],[3]	(3)	[2],[3]	(8)	[2],[3]	(7)	[2],[3]
Amortization of prior service cost					1	[2],[3]
Income before tax	(4)	[2]	(3)	[2]	(7)	[2]	(7)	[2]
Provision for income taxes			1	[2]	2	[2]	3	[2]
Net income	(4)	[2]	(2)	[2]	(5)	[2]	(4)	[2]
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes							(3)	[2]
Net income							7	[2]
Realized gains on investments							10	[2]
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before tax	29	[2]	6	[2]	50	[2]	12	[2]
Provision for income taxes	(11)	[2]	(2)	[2]	(18)	[2]	(4)	[2]
Net income	18	[2]	4	[2]	32	[2]	8	[2]
Realized gains on designated hedges	11	[2]	3	[2]	19	[2]	6	[2]
	18	[2]	3	[2]	31	[2]	6	[2]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	$ 14	[2]	$ 2	[2]	$ 27	[2]	$ 11	[2]

[1] As revised for the change in our method of recognizing pension expense. See Note 1 of Notes to Consolidated Financial Statements for a discussion of the change and the impacts of the change for the three and six months ended June 30, 2012.

[2] Amounts in parentheses indicate debits to the statement of income.

[3] These accumulated other comprehensive income components are included in net periodic pension cost. See Note 13 - Employee Retirement Plans for additional details.