XML 85 R71.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Of Financial Instruments (Aggregate Fair Value And Remaining Contractual Principal Balance Outstanding On Fair Value Option) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
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 $ 180 $ 158
Medium-term notes, fair value 115 101
Medium-term notes, difference 65 57
Variable Interest Entity [Member]    
Schedule Of Fair Value Of Separate Accounts By Major Category Of Investment [Line Items]    
Loans receivable, contractual outstanding principal 2,296 1,258
Variable interest entity notes, contractual outstanding principal 1,882 2,449
Loans receivable, fair value 1,679 1,066
Variable interest entity notes, fair value 1,069 1,351
Loans receivable, difference 617 192
Variable interest entity notes, difference 813 1,098
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 732 965
Loans receivable, 90 days or more past due, contractual outstanding principal 170 143
Loans receivable, fair value 727 894
Loans receivable, 90 days or more past due, fair value 32 22
Loans receivable, difference 5 71
Loans receivable, 90 days or more past due, difference 138 121
Corporate 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 1,394 150
Loans receivable, fair value 920 150
Loans receivable, difference $ 474 $ 0