Leases - EGTS - Schedule of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 128	$ 136	$ 136
Weighted-average remaining operating lease term (years)	7 years 2 months 12 days	7 years 4 months 24 days	7 years 4 months 24 days
Weighted-average operating lease discount rate	5.10%	4.50%	4.10%
EGTS
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 2	$ 2	$ 2
Weighted-average remaining operating lease term (years)	11 years 8 months 12 days	12 years 8 months 12 days	13 years 8 months 12 days
Weighted-average operating lease discount rate	4.30%	4.30%	4.30%