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Schedule of Aggregate Minimum Rental Commitments under Noncancelable Leases (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Capital Leases And Operating Leases [Line Items]  
Contractually required capital lease payments, due within one year of the balance sheet date $ 110
Contractually required capital lease payments, due within the second year from the balance sheet date 70
Contractually required capital lease payments, due within the third year from the balance sheet date 54
Contractually required capital lease payments, due within the fourth year from the balance sheet date 46
Contractually required capital lease payments, due within the fifth year from the balance sheet date 20
Contractually required capital lease payments, due after the fifth year from the balance sheet date 83
Contractually required capital lease payments 383
Less interest and executory costs 90
Present value of minimum lease payments 293
Less current installments 91
Long-term obligation at December 31, 2013 202
Contractually required operating lease payments, due within one year of the balance sheet date 2,255
Contractually required operating lease payments, due within the second year from the balance sheet date 2,020
Contractually required operating lease payments, due within the third year from the balance sheet date 1,703
Contractually required operating lease payments, due within the fourth year from the balance sheet date 1,379
Contractually required operating lease payments, due within the fifth year from the balance sheet date 1,085
Contractually required operating lease payments, due after the fifth year from the balance sheet date 3,748
Contractually required operating lease payments $ 12,190