Pension and Other Postretirement Employee Benefit Plans (Change in Fair Value of Plan Assets, Level 3 Reconciliation (Details) - Defined Benefit Plan, Insurance Annuity Contract $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	$ 0
Purchases	349
Unrealized gains/(losses)	2
Fair value of plan assets at end of year	$ 351