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Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Schedule of Future Minimum Rental Income under Land Lease Agreements (Detail)

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Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Schedule of Future Minimum Rental Income under Land Lease Agreements (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Receivables [Abstract]  
From April 1, 2015 to December 31, 2015 $ 8us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableRemainderOfFiscalYear
2016 10us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
2017 10us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
2018 10us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
2019 10us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
2020 10us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Thereafter 333us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Total $ 391us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable