SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 3,380	$ 3,290	$ 3,090
Deferred Income Taxes	311	58	185
Change in Other Noncurrent Assets	(559)	(348)	(446)
Change in Other Noncurrent Liabilities	269	306	29
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(246)	(156)	236
Accounts Payable	252	85	(253)
Other Current Assets	85	(13)	(44)
Other Current Liabilities	103	182	(162)
Net Cash Flows from Operating Activities	6,944	6,804	5,012
INVESTING ACTIVITIES
Construction Expenditures	(8,453)	(7,631)	(7,378)
Net Cash Flows Used for Investing Activities	(11,939)	(7,596)	(6,267)
FINANCING ACTIVITIES
Issuance of Common Stock, Net	775	552	1,000
Issuance of Long-term Debt	8,261	5,117	5,463
Issuance of Short-term Debt with Original Maturities greater than 90 Days	320	724	1,070
Change in Short-term Debt with Original Maturities less than 90 Day, Net	(658)	(159)	(1,223)
Retirement of Long-term Debt	(3,649)	(2,685)	(2,196)
Redemption of Short-term Debt with Original Maturities greater than 90 Days	(678)	(871)	(1,129)
Dividends Paid on Common Stock	(2,008)	(1,898)	(1,752)
Other Financing Activities	(8)	(50)	(80)
Net Cash Flows from Financing Activities	5,017	659	1,077
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	22	(133)	(178)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	246	379	557
Cash, Cash Equivalents and Restricted Cash at End of Period	268	246	379
Parent Company
OPERATING ACTIVITIES
Net Income	3,580	2,967	2,208
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	1	1	1
Amortization of KPCo Basis Difference	(21)	(21)	(17)
Deferred Income Taxes	(12)	(53)	60
Equity Earnings of Unconsolidated Subsidiaries	(3,908)	(3,280)	(2,468)
Cash Dividends Received from Unconsolidated Subsidiaries	3,483	1,143	686
Change in Other Noncurrent Assets	(3)	5	(28)
Change in Other Noncurrent Liabilities	61	71	92
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	10	18	29
Accounts Payable	(1)	(17)	(16)
Other Current Assets	10	0	(4)
Other Current Liabilities	10	55	(14)
Net Cash Flows from Operating Activities	3,210	889	529
INVESTING ACTIVITIES
Construction Expenditures	(48)	(1)	(1)
Change in Advances to Affiliates, Net	66	60	2,008
Investment in Equity Method Investments	(100)	0	0
Capital Contributions to Unconsolidated Subsidiaries	(1,869)	(400)	(790)
Return of Capital Contributions from Unconsolidated Subsidiaries	0	899	57
Issuance of Notes Receivable to Unconsolidated Subsidiaries	(1,000)	0	(210)
Repayment of Notes Receivable from Affiliated Companies	0	190	0
Net Cash Flows Used for Investing Activities	(2,951)	748	1,064
FINANCING ACTIVITIES
Issuance of Common Stock, Net	775	552	1,000
Issuance of Long-term Debt	2,966	1,285	1,830
Issuance of Short-term Debt with Original Maturities greater than 90 Days	320	724	1,070
Change in Short-term Debt with Original Maturities less than 90 Day, Net	(655)	(172)	(1,365)
Retirement of Long-term Debt	(1,300)	(1,104)	(1,050)
Change in Advances from Affiliates, Net	380	(222)	(192)
Redemption of Short-term Debt with Original Maturities greater than 90 Days	(678)	(871)	(1,129)
Dividends Paid on Common Stock	(2,008)	(1,898)	(1,752)
Other Financing Activities	(44)	(41)	(61)
Net Cash Flows from Financing Activities	(244)	(1,747)	(1,649)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	15	(110)	(56)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	88	198	254
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 103	$ 88	$ 198