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Debt, Principal Payments Due on Debt and Capital Lease Obligations (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Principal Payments Due on Debt
2013	$ 580
2014	200
2015	475
2016	0
2017	950
Thereafter	4,824
Net unamortized discount and fair value adjustments	(29)	(51)
Total debt	7,000	7,690
Future Minimum Rental on Capital Lease Obligations
2013	12
2014	10
2015	9
2016	8
2017	7
Thereafter	35
Less interest expense	(32)
Total capital lease obligations	$ 49	$ 51

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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.

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