Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 2,327	$ 3,016
Percent of total assets	100.00%	100.00%
Growth-Oriented
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,434	$ 1,812
Percent of total assets	62.00%	60.00%
Equity
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,249	$ 1,559
Percent of total assets	54.00%	52.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 144	$ 204
Percent of total assets	6.00%	7.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 41	$ 49
Percent of total assets	2.00%	1.00%
Immunizing
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 893	$ 1,204
Percent of total assets	38.00%	40.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 777	$ 1,145
Percent of total assets	33.00%	38.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 116	$ 59
Percent of total assets	5.00%	2.00%