Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 2,409	$ 2,465	$ 2,299
Percent of total assets	100.00%	100.00%
Growth-Oriented
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 784	$ 1,313
Percent of total assets	33.00%	53.00%
Equity
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 709	$ 1,182
Percent of total assets	29.00%	48.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 57	$ 117
Percent of total assets	3.00%	4.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 18	$ 14
Percent of total assets	1.00%	1.00%
Immunizing
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,625	$ 1,152
Percent of total assets	67.00%	47.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,129	$ 916
Percent of total assets	46.00%	37.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 496	$ 236
Percent of total assets	21.00%	10.00%