Leases - EGTS - Schedule of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 136	$ 136	$ 161
Weighted-average remaining operating lease term (years)	7 years 4 months 24 days	7 years 4 months 24 days	7 years 7 months 6 days
Weighted-average operating lease discount rate	4.50%	4.10%	4.30%
EGTS
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 2	$ 2	$ 3
Weighted-average remaining operating lease term (years)	12 years 8 months 12 days	13 years 8 months 12 days	14 years 8 months 12 days
Weighted-average operating lease discount rate	4.30%	4.30%	4.30%