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Shareholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent [Roll Forward]      
Beginning balance $ 10,332 $ 9,797 $ 7,693
Other comprehensive (loss) income before reclassification (3) 38 (7)
Amounts reclassified from accumulated other comprehensive income (loss) (3)   4
Net other comprehensive income (loss) (6) 38 (3)
Ending balance 10,837 10,332 9,797
Employee Benefit Plan Funded Status      
AOCI Attributable to Parent [Roll Forward]      
Beginning balance (95) (96) (93)
Other comprehensive (loss) income before reclassification 0 1 (3)
Amounts reclassified from accumulated other comprehensive income (loss) 0   0
Net other comprehensive income (loss) 0 1 (3)
Ending balance (95) (95) (96)
Amortization of Prior Service Cost      
AOCI Attributable to Parent [Roll Forward]      
Beginning balance 1 1 1
Other comprehensive (loss) income before reclassification 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 0   0
Net other comprehensive income (loss) 0 0 0
Ending balance 1 1 1
Amortization of Actuarial Loss      
AOCI Attributable to Parent [Roll Forward]      
Beginning balance 74 74 70
Other comprehensive (loss) income before reclassification 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss) 1   4
Net other comprehensive income (loss) 1 0 4
Ending balance 75 74 74
Gain (Loss) on Cash Flow Hedge      
AOCI Attributable to Parent [Roll Forward]      
Beginning balance 30 (9) (1)
Other comprehensive (loss) income before reclassification (4) 39 (8)
Amounts reclassified from accumulated other comprehensive income (loss) 0   0
Net other comprehensive income (loss) (4) 39 (8)
Ending balance 26 30 (9)
Gain (Loss) on Fixed-Income Securities      
AOCI Attributable to Parent [Roll Forward]      
Beginning balance 2 4 0
Other comprehensive (loss) income before reclassification 1 (2) 4
Amounts reclassified from accumulated other comprehensive income (loss) (4)   0
Net other comprehensive income (loss) (3) (2) 4
Ending balance (1) 2 4
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent [Roll Forward]      
Beginning balance 12 (26) (23)
Net other comprehensive income (loss) (6) 38 (3)
Ending balance $ 6 $ 12 $ (26)