Leases - NPC - Schedule of Operating and Finance Lease, Supplemental Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating cash flows from operating leases	$ (141)	$ (163)	$ (152)
Operating cash flows from finance leases	(36)	(38)	(40)
Financing cash flows from finance leases	(25)	(28)	(24)
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	131	119	83
Finance leases	3	2	19
NPC
Lessee, Lease, Description [Line Items]
Operating cash flows from operating leases	(3)	(3)	(3)
Operating cash flows from finance leases	(28)	(29)	(34)
Financing cash flows from finance leases	(17)	(16)	(15)
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	0	0	1
Finance leases	$ 3	$ 1	$ 9