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Leases - Minimum Future Lease Payments to be Received from Sales-Type and Direct Financing Leases (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Capital Leases, Future Minimum Payments Receivable, Fiscal Year Maturity [Abstract]  
2016 $ 3,772
2017 3,207
2018 1,880
2019 756
2020 307
Thereafter $ 335