Note 8 - Debt (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Long-term Debt
Total long-term debt	$ 1,521,000,000	$ 1,525,000,000
Short-term Debt
Capital lease obligations, current	12,000,000	13,000,000
Total short-term debt	564,000,000	565,000,000
Total debt	2,085,000,000	2,090,000,000
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Short-term Debt
Estimated fair value of notes included in long-term debt	1,500,000,000
GSI
Short-term Debt
Capital lease obligations	25,000,000
Imputed interest	(1,000,000)
Total present value of minimum lease payments	24,000,000
Commercial Paper [Member]
Short-term Debt
Short-term debt	550,000,000	550,000,000
Commercial paper program amount	2,000,000,000
Debt maturity date range, end (in days)	P397D
Weighted average remaining term on commercial paper notes (in days)	56 days
Weighted-average interest rate	0.16%
Credit Agreement
Commercial paper program amount	2,000,000,000
Notes Payable, Other Payables [Member]
Short-term Debt
Short-term debt	2,000,000	2,000,000
Line of Credit [Member]
Credit Agreement
Borrowings outstanding	0
Letters of credit outstanding	0
Maximum borrowing capacity on unsecured revolving credit facility	3,000,000,000
Available borrowing capacity	2,000,000,000
Line of credit facility remaining borrowing capacity	1,000,000,000
Unsecured Debt [Member]
Long-term Debt
Long-term debt	1,495,000,000	1,495,000,000
Short-term Debt
Amortization of debt issuance costs	8,000,000
Unsecured Debt [Member] | Notes 2013 [Member]
Long-term Debt
Coupon Rate	0.875%	0.875%
Long-term debt	400,000,000	400,000,000
Effective Interest Rate	0.946%	0.946%
Unsecured Debt [Member] | Notes 2015 [Member]
Long-term Debt
Coupon Rate	1.625%	1.625%
Long-term debt	598,000,000	598,000,000
Effective Interest Rate	1.703%	1.703%
Unsecured Debt [Member] | Notes 2020 [Member]
Long-term Debt
Coupon Rate	3.25%	3.25%
Long-term debt	497,000,000	497,000,000
Effective Interest Rate	3.319%	3.319%
Notes Payable, Other Payables [Member]
Long-term Debt
Long-term debt	14,000,000	15,000,000
Capital Lease Obligations [Member]
Long-term Debt
Long-term debt	$ 12,000,000	$ 15,000,000
Capital Lease Obligations [Member] | GSI
Short-term Debt
Interest rate, minimum	3.00%
Interest rate, maximum	9.00%
Mortgages [Member] | GSI
Long-term Debt
Coupon Rate	6.30%