v3.25.2
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 8,856 $ 8,356 $ 8,620 $ 8,140
Amounts reclassified in period to Condensed Statements of Income:        
Ending balance 9,121 8,504 9,121 8,504
Total in AOCI        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 76 105 42 (116)
Other comprehensive income before reclassification - recorded to the Condensed Statements of Condition (83) 31 (40) 264
Amounts reclassified in period to Condensed Statements of Income:        
Net interest income (5) (11) (13) (22)
Noninterest expense     (1) (1)
Ending balance (12) 125 (12) 125
Net Unrealized - Available-for-sale Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 28 18 (33) (198)
Other comprehensive income before reclassification - recorded to the Condensed Statements of Condition (74) 25 (13) 241
Amounts reclassified in period to Condensed Statements of Income:        
Ending balance (46) 43 (46) 43
Net Unrealized - Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 40 79 67 72
Other comprehensive income before reclassification - recorded to the Condensed Statements of Condition (9) 6 (28) 24
Amounts reclassified in period to Condensed Statements of Income:        
Net interest income (5) (11) (13) (22)
Ending balance 26 74 26 74
Post - Retirement Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 8 8 8 10
Other comprehensive income before reclassification - recorded to the Condensed Statements of Condition 0 0 1 (1)
Amounts reclassified in period to Condensed Statements of Income:        
Noninterest expense     (1) (1)
Ending balance $ 8 $ 8 $ 8 $ 8