Leases - EGTS - Schedule of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating	$ 136	$ 161	$ 151
Short-term	44	15	20
Total lease costs	$ 788	$ 848	$ 821
Weighted-average remaining lease term (years):
Operating leases	7 years 4 months 24 days	7 years 7 months 6 days	7 years 4 months 24 days
Finance leases	28 years 1 month 6 days	28 years 1 month 6 days	27 years 6 months
Weighted-average discount rate:
Operating leases	4.10%	4.30%	4.50%
Finance leases	8.60%	8.60%	8.50%
EGTS
Lessee, Lease, Description [Line Items]
Operating	$ 2	$ 3	$ 6
Short-term	0	0	3
Total lease costs	$ 2	$ 3	$ 9
Weighted-average remaining lease term (years):
Operating leases	13 years 8 months 12 days	14 years 8 months 12 days	11 years 8 months 12 days
Finance leases	0 years	0 years	4 years 7 months 6 days
Weighted-average discount rate:
Operating leases	4.30%	4.30%	4.40%
Finance leases	0.00%	0.00%	2.60%