Pension and Other Postretirement Employee Benefit Plans - Gains and Losses (Details) $ in Billions	12 Months Ended
	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Decrease in plan assets as a result of settlement and remeasurement of the plan	$ 4.0
Decrease in benefit obligation as a result of settlement and remeasurement of the plan	2.6
Decrease in accumulated other comprehensive income as a result of settlement and remeasurement of the plan	$ 1.4
Defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Percent above which amortization of net gains and losses is included in annual net periodic benefit cost	10.00%