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Statements of Comprehensive Income - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 881 $ 914 $ 962
Other comprehensive income (loss)      
Net unrealized gains (losses) on available-for-sale securities 210 151 (64)
Pension and postretirement benefits 0 0 1
Total other comprehensive income (loss) 210 151 (63)
TOTAL COMPREHENSIVE INCOME (LOSS) $ 1,091 $ 1,065 $ 899