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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
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 101 $ 86 $ 96 $ 146
Total gains/(losses) included in earnings, assets $ (18) $ (0) $ (13) $ (67)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Income Other Income Other Income Other Income
Unrealized gains/(losses) included in OCI, assets $ 0 [1] $ 0 [2] $ 0 [3] $ 0 [4]
Purchases, assets 1 4 2 15
Issuances, assets 0 0 0 0
Settlements, assets (1) (1) (2) (3)
Sales, assets 0 (0) 0 (2)
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 83 89 83 89
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (18) 1 (14) (67)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2] 0 [3] 0 [4]
Beginning balance, fair value liabilities 74 76 72 132
Total (gains)/losses included in earnings, liabilities $ 2 $ 6 $ 13 $ 34
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, before Tax
Unrealized (gains)/losses included in OCI, liabilities $ 4 [5] $ (6) [6] $ 2 [7] $ (31) [8]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Income Other Income Other Income Other Income
Purchases, liabilities $ 0 $ 0 $ 0 $ 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (1) (0) (8) (39)
Sales, liabilities 0 (0) 0 (20)
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 79 76 79 76
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 (6) 11 (5)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 4 [5] (6) [6] 2 [7] (3) [8]
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 33 31 28 35
Total gains/(losses) included in earnings, assets 1 (0) 7 (2)
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2] 0 [3] 0 [4]
Purchases, assets 0 0 (0) 0
Issuances, assets 0 0 0 0
Settlements, assets (1) (1) (2) (3)
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 33 30 33 30
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 (0) 6 (4)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2] 0 [3] 0 [4]
Corporate Obligations [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 16 10 16 1
Total gains/(losses) included in earnings, assets 0 (0) (1) (2)
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2] 0 [3] 0 [4]
Purchases, assets 1 4 2 15
Issuances, assets 0 0 0 0
Settlements, assets 0 0   0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 17 [9],[10] 14 [11] 17 [9],[10] 14 [11]
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 1 (1) 0
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2] 0 [3] 0 [4]
Equity investments [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 52 45 52 108
Total gains/(losses) included in earnings, assets (19) (0) (19) (63)
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2] 0 [3] 0 [4]
Purchases, assets 0 0 0 0
Issuances, assets 0 0 0 0
Settlements, assets 0 0   0
Sales, assets 0 0 0 0
Transfers into level 3, assets 0 0 0 0
Transfers out of level 3, assets 0 0 0 0
Ending balance, fair value assets 33 45 33 45
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (19) (0) (19) (63)
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets 0 [1] 0 [2] 0 [3] 0 [4]
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 38 36 35 40
Total (gains)/losses included in earnings, liabilities 0 (6) 5 (0)
Unrealized (gains)/losses included in OCI, liabilities 4 [5] (6) [6] 2 [7] (4) [8]
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 42 36 42 36
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 (6) 5 (0)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 4 [5] (6) [6] 2 [7] (4) [8]
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 26 31 31 78
Total (gains)/losses included in earnings, liabilities 1 1 3 40
Unrealized (gains)/losses included in OCI, liabilities 0 [5] (0) [6] 0 [7] (27) [8]
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (1) (0) (8) (39)
Sales, liabilities 0 (0) 0 (20)
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 26 32 26 32
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 1 1 1
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 0 [5] 0 [6] 0 [7] 1 [8]
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 10 9 6 14
Total (gains)/losses included in earnings, liabilities 1 (1) 5 (6)
Unrealized (gains)/losses included in OCI, liabilities 0 [5] 0 [6] 0 [7] 0 [8]
Purchases, liabilities 0 0 0 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities 0 0 0 0
Sales, liabilities 0 0 0 0
Transfers into Level 3, liabilities 0 0 0 0
Transfers out of Level 3, liabilities 0 0 0 0
Ending balance, fair value liabilities 11 8 11 8
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 (1) 5 (6)
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held $ 0 [5] 0 [6] $ 0 [7] 0 [8]
Other Assets [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets       2
Total gains/(losses) included in earnings, assets       0
Unrealized gains/(losses) included in OCI, assets [4]       0
Purchases, assets       0
Issuances, assets       0
Settlements, assets       0
Sales, assets       (2)
Transfers into level 3, assets       0
Transfers out of level 3, assets       0
Ending balance, fair value assets   $ 0   0
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets       0
Change in unrealized gains/(losses) for the period included in OCI for Assets still held, assets [4]       $ 0
[1] Reported within the "Unrealized gains (losses) on available-for-sale securities" on the Company's consolidated statements of comprehensive income (loss).
[2] Reported within the "Unrealized gains (losses) on available-for-sale securities" on the Company's consolidated statements of comprehensive income (loss).
[3] Reported within the "Unrealized gains (losses) on available-for-sale securities" on the Company's consolidated statements of comprehensive income (loss).
[4] Reported within the "Unrealized gains (losses) on available-for-sale securities" on the Company's consolidated statements of comprehensive income (loss).
[5] Reported within the "Instrument-specific credit risk of liabilities measured at fair value" on the Company's consolidated statements of comprehensive income (loss).
[6] Reported within the "Instrument-specific credit risk of liabilities measured at fair value" on the Company's consolidated statements of comprehensive income (loss).
[7] Reported within the "Instrument-specific credit risk of liabilities measured at fair value" on the Company's consolidated statements of comprehensive income (loss).
[8] Reported within the "Instrument-specific credit risk of liabilities measured at fair value" on the Company's consolidated statements of comprehensive income (loss).
[9] Includes loans carried at fair value of $16 million.
[10] Includes loans carried at fair value of $16 million.
[11] Includes loans carried at fair value of $13 million.