Revenue from Contracts with Customers - NPC (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,686	$ 6,394	$ 13,358	$ 12,760
Regulated \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	3,278	3,146	6,246	5,970
NPC
Disaggregation of Revenue [Line Items]
Other revenue	1	1	2	1
Operating revenue	694	597	1,185	1,028
NPC \| Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	693	596	1,183	1,027
NPC \| Regulated \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	678	580	1,156	996
NPC \| Regulated \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	15	16	27	31
NPC \| Customer Revenue \| Regulated \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	675	576	1,149	988
NPC \| Customer Revenue \| Regulated \| Regulated retail electric \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	370	314	604	531
NPC \| Customer Revenue \| Regulated \| Regulated retail electric \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	146	128	264	226
NPC \| Customer Revenue \| Regulated \| Regulated retail electric \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	155	133	273	230
NPC \| Customer Revenue \| Regulated \| Regulated retail electric \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	4	1	8	1
NPC \| Distribution only service \| Regulated \| Regulated retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 3	$ 4	$ 7	$ 8

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