Consolidated Statements of Cash Flows - SPPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ 4,300	$ 3,020	$ 2,721
Adjustments to reconcile net income to net cash flows from operating activities:
Allowance for equity funds	(352)	(267)	(167)
Net power cost deferrals	(41)	(629)	(1,290)
Amortization of deferred energy	584	354	357
Other changes in regulatory assets and liabilities	(198)	(260)	(146)
Deferred income taxes and investment tax credits, net	(267)	(257)	(467)
Other, net	50	(46)	59
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(542)	(134)	150
Accrued property, income and other taxes, net	144	(58)	397
Accounts payable and other liabilities	252	280	579
Net cash flows from operating activities	8,442	7,132	9,359
Cash flows from investing activities:
Capital expenditures	(9,013)	(9,148)	(7,505)
Proceeds from sales of marketable securities	2,615	2,520	2,464
Net cash flows from investing activities	(6,035)	(5,899)	(7,750)
Cash flows from financing activities:
Long-term debt reacquired	(2,794)	(2,821)	(1,494)
Net (repayments of) proceeds from short-term debt	(3,017)	3,024	(867)
Other, net	(37)	(54)	(274)
Net cash flows from financing activities	(2,620)	(1,250)	(1,006)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(225)	(6)	573
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,811	1,817	1,244
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,586	1,811	1,817
SPPC
Cash flows from operating activities:
Net income (loss)	85	117	118
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	181	185	149
Allowance for equity funds	(22)	(14)	(7)
Net power cost deferrals	135	117	(267)
Amortization of deferred energy	28	83	97
Other changes in regulatory assets and liabilities	5	1	(1)
Deferred income taxes and investment tax credits, net	(49)	(56)	31
Other, net	(1)	0	3
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	13	(7)	(52)
Inventories	(44)	(38)	(14)
Accrued property, income and other taxes, net	(10)	18	(13)
Accounts payable and other liabilities	149	13	65
Net cash flows from operating activities	470	419	109
Cash flows from investing activities:
Capital expenditures	(674)	(388)	(351)
Proceeds from sales of marketable securities	1	0	0
Net cash flows from investing activities	(673)	(388)	(351)
Cash flows from financing activities:
Proceeds from long-term debt	233	393	248
Long-term debt reacquired	0	0	(265)
Repayments of long-term debt	0	(250)	0
Net (repayments of) proceeds from short-term debt	0	0	(159)
Notes payable to affiliate, net	0	(70)	70
Dividends paid	(200)	(100)	(70)
Proceeds from equity contributions	150	0	465
Other, net	(8)	(8)	(7)
Net cash flows from financing activities	175	(35)	282
Net change in cash and cash equivalents and restricted cash and cash equivalents	(28)	(4)	40
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	52	56	16
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 24	$ 52	$ 56