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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, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
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 $ 253 $ 276
Medium-term notes, fair value 202 203
Medium-term notes, difference 51 73
Variable Interest Entity [Member]
    
Schedule Of Fair Value Of Separate Accounts By Major Category Of Investment [Line Items]    
Loans receivable, contractual outstanding principal 2,281 2,077
Variable interest entity notes, contractual outstanding principal 3,704 3,787
Loans receivable, fair value 1,902 1,612
Variable interest entity notes, fair value 2,463 2,356
Loans receivable, difference 379 465
Variable interest entity notes, difference 1,241 1,431
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 1,636 1,846
Loans receivable, 90 days or more past due, contractual outstanding principal 236 231
Loans receivable, fair value 1,447 1,562
Loans receivable, 90 days or more past due, fair value 48 50
Loans receivable, difference 189 284
Loans receivable, 90 days or more past due, difference 188 181
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 409  
Loans receivable, fair value 407  
Loans receivable, difference $ 2