Employee Benefits - Benefit Obligations, Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Combined Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 5,212	$ 5,295	$ 9,678	$ 12,202
Short term interest crediting rates	4.00%
Long term interest crediting rates	3.50%
Change in Assumptions for Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation			$ 37