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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) - Fair Value Inputs Level 3 [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 1,552 $ 1,834
Realized gains/(losses), assets   (1)
Unrealized gains/(losses) included in earnings, assets 170 (16)
Unrealized gains/(losses) included in OCI, assets 2 32
Foreign exchange recognized in OCI or earnings, assets (2) 5
Purchases, assets 737 278
Settlements, assets (324) (344)
Sales, assets (3) (109)
Transfers into level 3, assets 31 17
Transfers out of level 3, assets (23) (144)
Ending balance, fair value assets 2,140 1,552
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 168 8
Beginning balance, fair value liabilities 661 1,531
Realized gains/(losses), liabilities 51 43
Unrealized gains/(losses included in earnings, liabilities 53 (45)
Foreign exchange recognized in OCI or earnings, liabilities 15 (1)
Purchases, liabilities 7 9
Settlements, liabilities (141) (245)
Sales, liabilities (51) (631)
Ending balance, fair value liabilities 595 661
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 70 (38)
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 916 1,185
Unrealized gains/(losses) included in earnings, assets 79 (11)
Settlements, assets (236) (258)
Ending balance, fair value assets 759 916
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 79 (11)
Corporate Loans Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 150 107
Unrealized gains/(losses) included in earnings, assets 89 4
Purchases, assets 719 146
Settlements, assets (38)  
Sales, assets   (107)
Ending balance, fair value assets 920 150
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 89 4
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 404 396
Unrealized gains/(losses) included in earnings, assets 3 8
Ending balance, fair value assets 407 404
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 3 8
State and municipal bonds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   41
Purchases, assets   122
Settlements, assets   (39)
Sales, assets   (1)
Transfers into level 3, assets 1 2
Transfers out of level 3, assets (1) (125)
Foreign Government Debt [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   2
Foreign exchange recognized in OCI or earnings, assets   (1)
Purchases, assets   10
Settlements, assets   (10)
Transfers out of level 3, assets   (1)
Corporate Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 2 7
Purchases, assets 1  
Transfers into level 3, assets   2
Transfers out of level 3, assets (1) (7)
Ending balance, fair value assets 2 2
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   11
Unrealized gains/(losses) included in earnings, assets   (6)
Settlements, assets (2) (2)
Transfers into level 3, assets 6 2
Transfers out of level 3, assets (4) (5)
Residential Mortgage Backed Non Agency [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Unrealized gains/(losses) included in earnings, assets   (1)
Transfers into level 3, assets   1
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Sales, assets   (1)
Transfers into level 3, assets 14 1
Transfers out of level 3, assets (7)  
Ending balance, fair value assets 7  
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Unrealized gains/(losses) included in earnings, assets   (4)
Sales, assets (3)  
Transfers into level 3, assets 9 4
Ending balance, fair value assets 6  
Collateralized Debt Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 15 29
Unrealized gains/(losses) included in OCI, assets   18
Settlements, assets (7) (32)
Transfers out of level 3, assets (8)  
Ending balance, fair value assets   15
Collateralized Debt Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1 1
Ending balance, fair value assets 1 1
Other Asset Backed [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 44 38
Realized gains/(losses), assets   (1)
Unrealized gains/(losses) included in earnings, assets   (1)
Unrealized gains/(losses) included in OCI, assets 2 14
Settlements, assets (41) (3)
Transfers out of level 3, assets   (3)
Ending balance, fair value assets 5 44
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   (1)
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 1 6
Unrealized gains/(losses) included in earnings, assets   (7)
Transfers into level 3, assets 1 5
Transfers out of level 3, assets (2) (3)
Ending balance, fair value assets   1
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 101 161
Unrealized gains/(losses included in earnings, liabilities (1) (3)
Foreign exchange recognized in OCI or earnings, liabilities 15 (1)
Settlements, liabilities   (56)
Ending balance, fair value liabilities 115 101
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 14 (4)
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 64 85
Realized gains/(losses), liabilities 51 43
Unrealized gains/(losses included in earnings, liabilities (1) (21)
Settlements, liabilities (51) (43)
Ending balance, fair value liabilities 63 64
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 (13)
Other Derivative Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 20 18
Unrealized gains/(losses included in earnings, liabilities 18 2
Settlements, liabilities (34)  
Ending balance, fair value liabilities 4 20
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 18 2
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 476 1,267
Unrealized gains/(losses included in earnings, liabilities 37 (23)
Purchases, liabilities   9
Settlements, liabilities (56) (146)
Sales, liabilities (51) (631)
Ending balance, fair value liabilities 406 476
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 37 (23)
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 19 11
Unrealized gains/(losses) included in earnings, assets 2 2
Foreign exchange recognized in OCI or earnings, assets (2) 6
Ending balance, fair value assets 19 19
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 $ 8
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Unrealized gains/(losses) included in earnings, assets (3)  
Purchases, assets 17  
Ending balance, fair value assets 14  
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (3)  
Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Unrealized gains/(losses included in earnings, liabilities 0  
Purchases, liabilities 7  
Ending balance, fair value liabilities 7  
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities $ 0