Note 8 - Debt (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Long-term Debt
Total long-term debt	$ 1,518,000,000	$ 1,518,000,000	$ 1,525,000,000
Short-term Debt
Capital lease obligations, current	12,000,000	12,000,000	13,000,000
Total short-term debt	564,000,000	564,000,000	565,000,000
Total debt	2,082,000,000	2,082,000,000	2,090,000,000
GSI
Capital Lease Obligations
Capital lease obligations	21,000,000	21,000,000
Imputed interest	(1,000,000)	(1,000,000)
Total present value of minimum lease payments	20,000,000	20,000,000
Commercial Paper [Member]
Short-term Debt
Short-term debt	550,000,000	550,000,000	550,000,000
Commercial Paper
Commercial paper program amount	2,000,000,000	2,000,000,000
Maximum days to maturity of debt instruments		397 days
Weighted-average interest rate	0.19%	0.19%
Weighted average remaining term on commercial paper notes (in days)		79 days
Credit Agreement
Commercial paper program amount	2,000,000,000	2,000,000,000
Notes Payable, Other Payables [Member]
Short-term Debt
Short-term debt	2,000,000	2,000,000	2,000,000
Line of Credit [Member]
Credit Agreement
Borrowings outstanding	0	0
Letters of credit outstanding	0	0
Maximum borrowing capacity on unsecured revolving credit facility	3,000,000,000	3,000,000,000
Available borrowing capacity	2,000,000,000	2,000,000,000
Line of credit facility remaining borrowing capacity	1,000,000,000	1,000,000,000
Unsecured Debt [Member]
Long-term Debt
Long-term debt	1,496,000,000	1,496,000,000	1,495,000,000
Short-term Debt
Interest expense	8,000,000	16,000,000
Unsecured Debt [Member] | Notes 2013 [Member]
Long-term Debt
Coupon Rate	0.875%	0.875%	0.875%
Long-term debt	400,000,000	400,000,000	400,000,000
Effective Interest Rate	0.946%	0.946%	0.946%
Unsecured Debt [Member] | Notes 2015 [Member]
Long-term Debt
Coupon Rate	1.625%	1.625%	1.625%
Long-term debt	598,000,000	598,000,000	598,000,000
Effective Interest Rate	1.703%	1.703%	1.703%
Unsecured Debt [Member] | Notes 2020 [Member]
Long-term Debt
Coupon Rate	3.25%	3.25%	3.25%
Long-term debt	498,000,000	498,000,000	497,000,000
Effective Interest Rate	3.319%	3.319%	3.319%
Unsecured Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Short-term Debt
Estimated fair value of notes included in long-term debt	1,500,000,000	1,500,000,000
Notes Payable, Other Payables [Member]
Long-term Debt
Long-term debt	14,000,000	14,000,000	15,000,000
Capital Lease Obligations [Member]
Long-term Debt
Long-term debt	$ 8,000,000	$ 8,000,000	$ 15,000,000
Capital Lease Obligations [Member] | GSI
Capital Lease Obligations
Interest rate, minimum		3.00%
Interest rate, maximum		9.00%
Mortgages [Member]
Long-term Debt
Coupon Rate	6.30%	6.30%