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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, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets $ 2,140 $ 1,552
Realized gains/(losses), assets 0 0
Unrealized gains/(losses) included in earnings, assets 34 170
Unrealized gains/(losses) included in OCI, assets (1) 2
Foreign exchange recognized in OCI or earnings, assets 0 (2)
Purchases, assets 5 737
Issuances, assets 0 0
Settlements, assets (122) (324)
Sales, assets (1,415) (3)
Transfers into level 3, assets 13 31
Transfers out of level 3, assets (17) (23)
Ending balance, fair value assets 637 2,140
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (13) 168
Beginning balance, fair value liabilities 595 661
Realized gains/(losses), liabilities 86 51
Unrealized gains/(losses included in earnings, liabilities (57) 53
Unrealized gains/(losses) included in OCI, liabilities 35 0
Foreign exchange recognized in OCI or earnings, liabilities (10) 15
Purchases, liabilities 0 7
Issuances, liabilities 8 0
Settlements, liabilities (144) (141)
Sales, liabilities 0 (51)
Transfers into Level 3, liabilities 0 0
Transfers out of Level 3, liabilities 0 0
Ending balance, fair value liabilities 513 595
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (67) 70
Residential Prime Financing Receivable [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 759 916
Unrealized gains/(losses) included in earnings, assets 14 79
Settlements, assets (114) (236)
Sales, assets (487)  
Ending balance, fair value assets 172 759
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (22) 79
Corporate Loans Receivable and Other Instruments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 920 150
Unrealized gains/(losses) included in earnings, assets 11 89
Purchases, assets   719
Settlements, assets (6) (38)
Sales, assets (925)  
Ending balance, fair value assets   920
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets   89
Loan Repurchase Commitments [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 407 404
Unrealized gains/(losses) included in earnings, assets 11 3
Ending balance, fair value assets 418 407
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 11 3
State and municipal bonds [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Transfers into level 3, assets   1
Transfers out of level 3, assets   (1)
Corporate Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 2 2
Purchases, assets   1
Transfers out of level 3, assets (2) (1)
Ending balance, fair value assets   2
Corporate Obligations [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Settlements, assets (1) (2)
Transfers into level 3, assets 6 6
Transfers out of level 3, assets   (4)
Ending balance, fair value assets 5  
Commercial Mortgage Backed Securities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 7  
Transfers into level 3, assets 7 14
Transfers out of level 3, assets (7) (7)
Ending balance, fair value assets 7 7
Commercial Mortgage Backed Securities [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 6  
Sales, assets   (3)
Transfers into level 3, assets   9
Transfers out of level 3, assets (6)  
Ending balance, fair value assets   6
Collateralized Debt Obligations [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   15
Settlements, assets   (7)
Transfers out of level 3, assets   (8)
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 5 44
Unrealized gains/(losses) included in OCI, assets (1) 2
Purchases, assets 5  
Settlements, assets (1) (41)
Sales, assets (3)  
Transfers out of level 3, assets (2)  
Ending balance, fair value assets 3 5
Other Asset Backed [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets   1
Transfers into level 3, assets   1
Transfers out of level 3, assets   (2)
Medium Term Notes [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 115 101
Realized gains/(losses), liabilities (9)  
Unrealized gains/(losses included in earnings, liabilities (1) (1)
Unrealized gains/(losses) included in OCI, liabilities 55  
Foreign exchange recognized in OCI or earnings, liabilities (10) 15
Settlements, liabilities (48)  
Ending balance, fair value liabilities 102 115
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (11) 14
Credit Derivatives [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 63 64
Realized gains/(losses), liabilities 56 51
Unrealized gains/(losses included in earnings, liabilities (30) (1)
Settlements, liabilities (56) (51)
Ending balance, fair value liabilities 33 63
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (30) 1
Other Derivative Liabilities [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 4 20
Unrealized gains/(losses included in earnings, liabilities 3 18
Settlements, liabilities   (34)
Ending balance, fair value liabilities 7 4
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 3 18
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 406 476
Realized gains/(losses), liabilities 39  
Unrealized gains/(losses included in earnings, liabilities (30) 37
Unrealized gains/(losses) included in OCI, liabilities (20)  
Foreign exchange recognized in OCI or earnings, liabilities 0  
Issuances, liabilities 8  
Settlements, liabilities (37) (56)
Sales, liabilities   (51)
Ending balance, fair value liabilities 366 406
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (30) 37
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 19 19
Unrealized gains/(losses) included in earnings, assets (2) 2
Foreign exchange recognized in OCI or earnings, assets 0 (2)
Ending balance, fair value assets 17 19
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (2) 0
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value assets 14  
Unrealized gains/(losses) included in earnings, assets 0 (3)
Purchases, assets   17
Ending balance, fair value assets 14 14
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 (3)
Other Payable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Beginning balance, fair value liabilities 7  
Unrealized gains/(losses included in earnings, liabilities 1 0
Purchases, liabilities   7
Settlements, liabilities (3)  
Ending balance, fair value liabilities 5 7
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities $ 1 $ 0