Leases - SPPC - Schedule of Lease Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating
2022	$ 157
2023	124
2024	93
2025	71
2026	55
Thereafter	186
Total undiscounted lease payments	686
Less - amounts representing interest	(109)
Operating leases	577	$ 569
Finance
2022	72
2023	62
2024	62
2025	60
2026	60
Thereafter	607
Total undiscounted lease payments	923
Less - amounts representing interest	(460)
Finance leases	463	514
Total
2022	229
2023	186
2024	155
2025	131
2026	115
Thereafter	793
Total undiscounted lease payments	1,609
Less - amounts representing interest	(569)
Total lease liabilities	1,040	1,083
SPPC
Operating
2022	1
2023	1
2024	1
2025	1
2026	1
Thereafter	24
Total undiscounted lease payments	29
Less - amounts representing interest	(14)
Operating leases	15	16
Finance
2022	16
2023	16
2024	15
2025	15
2026	15
Thereafter	149
Total undiscounted lease payments	226
Less - amounts representing interest	(111)
Finance leases	115	130
Total
2022	17
2023	17
2024	16
2025	16
2026	16
Thereafter	173
Total undiscounted lease payments	255
Less - amounts representing interest	(125)
Total lease liabilities	$ 130	$ 146

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