v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets $ 87 $ 97 $ 85 $ 96
Total gains/(losses) included in earnings, assets $ (3) $ 4 $ (2) $ 6
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 1 2 1
Issuances, assets 0 0 0 0
Settlements, assets 2 1 (2) (2)
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 83 101 83 101
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets $ (4) $ 3 $ (3) $ 4
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Income Other Income Other Income Other Income
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 79 70 83 72
Total (gains)/losses included in earnings, liabilities $ 0 $ 8 $ (2) $ 12
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
Unrealized (gains)/losses included in OCI, liabilities $ 1 [5] $ (2) [6] $ 0 [7] $ (2) [8]
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
Purchases, liabilities $ 0 $ 0 $ 0 $ 0
Issuances, liabilities 0 0 0 0
Settlements, liabilities (1) (2) (2) (8)
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 79 74 79 74
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 7 (2) 10
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 1 [5] (2) [6] 0 (2) [8]
Loans receivable - residential [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value assets 34 30 34 28
Total gains/(losses) included in earnings, assets 2 4 2 7
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 2 1 (2) (2)
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 34 33 34 33
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 1 3 1 5
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 19 15 18 16
Total gains/(losses) included in earnings, assets 0 (0) 0 (1)
Unrealized gains/(losses) included in OCI, assets 0 [1] 0 [2] 0 [3] 0 [4]
Purchases, assets 1 1 2 1
Issuances, assets 0 0 0 0
Settlements, assets 0 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 20 [9] 16 [10],[11] 20 [9] 16 [10],[11]
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets 0 (0) 0 (1)
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 34 52 33 52
Total gains/(losses) included in earnings, assets (5) 0 (4) 0
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 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 29 52 29 52
Change in unrealized gains/(losses) for the period included in earnings for assets still held, assets (5) 0 (4) 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]
Medium Term Notes [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 43 37 46 35
Total (gains)/losses included in earnings, liabilities (1) 3 (3) 5
Unrealized (gains)/losses included in OCI, liabilities 1 [5] (2) [6] 0 [7] (2) [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 43 38 43 38
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities (1) 3 (3) 5
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 1 [5] (2) [6] 0 (2) [8]
Variable Interest Entity Notes [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 24 27 25 31
Total (gains)/losses included in earnings, liabilities 0 1 0 3
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 (1) (2) (2) (8)
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 23 26 23 26
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 0 0 0 1
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held 0 [5] 0 [6] 0 0 [8]
Currency Derivatives [Member] | Variable Interest Entity Primary Beneficiary [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Beginning balance, fair value liabilities 12 6 12 6
Total (gains)/losses included in earnings, liabilities 1 4 1 4
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 13 10 13 10
Change in unrealized gains/(losses) for the period included in earnings for liabilities still held, liabilities 1 4 1 4
Change in Unrealized Gains/ (Losses) for the Period Included in OCI for Liabilities still held $ 0 [5] $ 0 [6] $ 0 $ 0 [8]
[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 $19 million.
[10] Includes loans carried at fair value of $15 million.
[11] Includes loans carried at fair value of $15 million