Capital and Operating Leases (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Capital and Operaing Lease [Line Items]
Capital Lease Payments in 2012	$ 9
Operating Leases Payments in 2012	37
Capital Lease Payments in 2013	7
Operating Lease Payments in 2013	29
Capital Lease Payments in 2014	9
Operating Lease Payments in 2014	24
Capital Lease Payments in 2015	7
Operating Lease Payments in 2015	20
Capital Lease Payments in 2016	3
Operating Lease Payments in 2016	18
Capital Lease Payments Thereafter	0
Operating Lease Payments Thereafter	67
Capital Lease - Total minimum payments	35
Operating Lease - Total minimum payments	195
Less imputed interest	5
Present value of net minimum lease payments	30
Less current portion	7
Non-current portion	$ 23	$ 43

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.