Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 2,474	$ 2,409	$ 2,465
Percent of total assets	100.00%	100.00%
Growth-Oriented
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 744	$ 784
Percent of total assets	30.00%	33.00%
Equity
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 597	$ 709
Percent of total assets	24.00%	29.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 112	$ 57
Percent of total assets	5.00%	3.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 35	$ 18
Percent of total assets	1.00%	1.00%
Immunizing
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,730	$ 1,625
Percent of total assets	70.00%	67.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 1,623	$ 1,129
Percent of total assets	66.00%	46.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Amount	$ 107	$ 496
Percent of total assets	4.00%	21.00%