Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Analysis of Portfolio by Type of Obligor and Credit Quality (Parenthetical) (Detail)

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Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Analysis of Portfolio by Type of Obligor and Credit Quality (Parenthetical) (Detail) - Jun. 30, 2015
$ in Millions
USD ($)
Transactions
Financing Receivable, Recorded Investment [Line Items]  
Number of transactions | Transactions 77
Financial receivable outstanding, Average Remaining Balance $ 11
Total aggregate remaining balance 25
Investment Grade By Independent Rating Agency [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Total financing receivable 62
U.S. Federal Government [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Total financing receivable 280
State, Local, Institutions [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Total financing receivable 102
Maximum [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Financial receivable outstanding, Average Remaining Balance 1
Commercial Investment Grade [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Financial receivable outstanding, Average Remaining Balance 10
Commercial Investment Grade [Member] | Residential Solar Loan [Member]  
Financing Receivable, Recorded Investment [Line Items]  
Total financing receivable $ 137