Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Lease obligations
Rental expenses for all leases, including leases with terms of less than one year	$ 128	$ 97	$ 169
Depreciation expense for assets held under capital lease	20	20	20
Aggregate carrying amount of assets held under capital lease
Property and equipment, cost	752	745
Accumulated depreciation	(84)	(64)
Property and equipment, net	668	681
Capital lease, future minimum rental payments
2014	66
2015	71
2016	72
2017	72
2018	72
Thereafter	765
Total future minimum rental payment	1,118
Less amount representing imputed interest	(481)
Present value of future minimum rental payments under capital leases	637
Less current portion included in debt due within one year	(20)
Long-term capital lease obligation	617
Operating leases, future minimum rental payments
2014	25
2015	25
2016	20
2017	11
2018	10
Thereafter	87
Total future minimum rental payment	$ 178

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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