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Fair Value Of Financial Instruments (Aggregate Fair Value And Remaining Contractual Principal Balance Outstanding On Fair Value Option) (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Non Variable Interest Entity [Member]    
Schedule Of Fair Value Of Separate Accounts By Major Category Of Investment [Line Items]    
Medium-term notes, contractual outstanding principal $ 228 $ 217
Medium-term notes, fair value 165 161
Medium-term notes, difference 63 56
Variable Interest Entity [Member]    
Schedule Of Fair Value Of Separate Accounts By Major Category Of Investment [Line Items]    
Loans receivable, contractual outstanding principal 1,626 1,619
Variable interest entity notes, contractual outstanding principal 3,692 3,663
Loans receivable, fair value 1,368 1,292
Variable interest entity notes, fair value 2,204 2,362
Loans receivable, difference 258 327
Variable interest entity notes, difference 1,488 1,301
Residential Mortgage Loans [Member] | Variable Interest Entity [Member]    
Schedule Of Fair Value Of Separate Accounts By Major Category Of Investment [Line Items]    
Loans receivable, contractual outstanding principal 1,197 1,260
Loans receivable, 90 days or more past due, contractual outstanding principal 176 177
Loans receivable, fair value 1,080 1,149
Loans receivable, 90 days or more past due, fair value 35 36
Loans receivable, difference 117 111
Loans receivable, 90 days or more past due, difference 141 141
Other Loans [Member] | Variable Interest Entity [Member]    
Schedule Of Fair Value Of Separate Accounts By Major Category Of Investment [Line Items]    
Loans receivable, contractual outstanding principal 107 107
Loans receivable, 90 days or more past due, contractual outstanding principal 146 75
Loans receivable, fair value 107 107
Loans receivable, 90 days or more past due, fair value 146 0
Loans receivable, difference 0 0
Loans receivable, 90 days or more past due, difference $ 0 $ 75