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Condensed Statements of Consolidated Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement of Comprehensive Income [Abstract]        
Net Income $ 193 $ 282 $ 771 $ 725
Other comprehensive income (loss):        
Adjustment to pension and other postretirement plans (net of tax of $-0-, $-0-, $-0-, and $-0-) 1 1 2 0
Net deferred gain from cash flow hedges (net of tax of $0, $-0-, $1, and $-0-) 0 2 4 2
Reclassification of deferred gain from cash flow hedges realized in net income (net of tax of $-0-, $-0-, $-0- and $-0-) (1) 0 (1) 0
Total 0 3 5 2
Comprehensive income 193 285 776 727
Income allocated to preferred shareholders 0 26 0 50
Comprehensive income available to common shareholders $ 193 $ 259 $ 776 $ 677