Leases - NPC - 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
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%
NPC
Lessee, Lease, Description [Line Items]
Variable	$ 369	$ 449	$ 434
Operating	2	2	3
Finance lease, amortization	14	13	12
Finance lease, interest expense	27	28	29
Total lease costs	$ 412	$ 492	$ 478
Weighted-average remaining lease term (years):
Operating leases	4 years 9 months 18 days	5 years 8 months 12 days	6 years 6 months
Finance leases	29 years 1 month 6 days	28 years 8 months 12 days	28 years 8 months 12 days
Weighted-average discount rate:
Operating leases	4.50%	4.50%	4.50%
Finance leases	8.60%	8.60%	8.60%