Leases - PAC - 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]
Variable	$ 552	$ 611	$ 592
Operating	136	161	151
Finance lease, amortization	20	23	18
Finance lease, interest expense	36	38	40
Short-term	44	15	20
Total lease costs	$ 788	$ 848	$ 821
Weighted-average remaining lease term (years):
Finance leases	28 years 1 month 6 days	28 years 1 month 6 days	27 years 6 months
Operating leases	4.10%	4.30%	4.50%
Weighted-average discount rate:
Finance leases	8.60%	8.60%	8.50%
Operating leases	7 years 4 months 24 days	7 years 7 months 6 days	7 years 4 months 24 days
PAC
Lessee, Lease, Description [Line Items]
Variable	$ 61	$ 56	$ 60
Operating	3	3	3
Finance lease, amortization	1	5	2
Finance lease, interest expense	1	2	2
Short-term	5	3	1
Total lease costs	$ 71	$ 69	$ 68
Weighted-average remaining lease term (years):
Finance leases	9 years 8 months 12 days	10 years 1 month 6 days	8 years 4 months 24 days
Operating leases	3.90%	3.70%	3.80%
Weighted-average discount rate:
Finance leases	11.40%	11.10%	10.50%
Operating leases	11 years 4 months 24 days	12 years 8 months 12 days	13 years 10 months 24 days