Leases - SPPC - 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
SPPC
Lessee, Lease, Description [Line Items]
Operating cash flows from operating leases	(1)	(1)	(2)
Operating cash flows from finance leases	(9)	(9)	(6)
Financing cash flows from finance leases	(7)	(7)	(5)
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	1	0	0
Finance leases	$ 1	$ 1	$ 89