SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - CONDENSED BALANCE SHEETS (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
CURRENT ASSETS
Cash and Cash Equivalents	$ 197	$ 203
Accounts Receivable:
Total Accounts Receivable	2,867	2,632
Prepayments and Other Current Assets	212	287
TOTAL CURRENT ASSETS	6,052	5,789
PROPERTY, PLANT AND EQUIPMENT
General	8,635	7,491
Total Property, Plant and Equipment	120,579	108,602
Accumulated Depreciation and Amortization	28,205	26,186
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET	92,374	82,416
OTHER NONCURRENT ASSETS
Deferred Charges and Other Noncurrent Assets	4,402	3,873
TOTAL OTHER NONCURRENT ASSETS	16,034	14,873
TOTAL ASSETS	114,460	103,078
Accounts Payable:
Accounts Payable	3,429	2,638
Short-term Debt	1,508	2,524
Long-term Debt Due Within One Year – Nonaffiliated	3,194	3,335
Accrued Interest	544	453
Other Current Liabilities	1,898	1,490
TOTAL CURRENT LIABILITIES	13,314	13,009
NONCURRENT LIABILITIES
Long-term Debt	44,128	39,308
Deferred Credits and Other Noncurrent Liabilities	905	801
TOTAL NONCURRENT LIABILITIES	68,890	63,045
TOTAL LIABILITIES	82,204	76,054
Temporary Equity [Abstract]
Contingently Redeemable Performance Share Awards	38	38
COMMON SHAREHOLDER’S EQUITY
Common Stock	3,523	3,472
Paid-in Capital	12,138	9,606
Retained Earnings	15,441	13,869
Accumulated Other Comprehensive Income (Loss)	36	(3)
TOTAL COMMON SHAREHOLDER’S EQUITY	31,138	26,944
TOTAL LIABILITIES AND EQUITY	114,460	103,078
Parent Company
CURRENT ASSETS
Cash and Cash Equivalents	103	88
Advances to Affiliates	1,879	1,945
Accounts Receivable:
Total Accounts Receivable	23	33
Prepayments and Other Current Assets	75	107
TOTAL CURRENT ASSETS	2,080	2,173
PROPERTY, PLANT AND EQUIPMENT
General	3	3
Total Property, Plant and Equipment	3	3
Accumulated Depreciation and Amortization	2	1
TOTAL PROPERTY, PLANT AND EQUIPMENT – NET	1	2
OTHER NONCURRENT ASSETS
Investments in Unconsolidated Subsidiaries	39,550	35,306
Affiliated Notes Receivable	1,105	105
Deferred Charges and Other Noncurrent Assets	245	184
TOTAL OTHER NONCURRENT ASSETS	40,900	35,595
TOTAL ASSETS	42,981	37,770
CURRENT LIABILITIES
Advances from Affiliates	887	507
Accounts Payable:
Short-term Debt	605	1,618
Long-term Debt Due Within One Year – Nonaffiliated	50	1,282
Accrued Interest	129	104
Other Current Liabilities	47	98
TOTAL CURRENT LIABILITIES	1,724	3,616
NONCURRENT LIABILITIES
Long-term Debt	10,050	7,124
Deferred Credits and Other Noncurrent Liabilities	31	48
TOTAL NONCURRENT LIABILITIES	10,081	7,172
TOTAL LIABILITIES	11,805	10,788
Temporary Equity [Abstract]
Contingently Redeemable Performance Share Awards	38	38
COMMON SHAREHOLDER’S EQUITY
Common Stock	3,523	3,472
Paid-in Capital	12,138	9,606
Retained Earnings	15,441	13,869
Accumulated Other Comprehensive Income (Loss)	36	(3)
TOTAL COMMON SHAREHOLDER’S EQUITY	31,138	26,944
TOTAL LIABILITIES AND EQUITY	42,981	37,770
Parent Company | Nonrelated Party
Accounts Payable:
Accounts Payable	1	5
Parent Company | Affiliated Entity
Accounts Receivable:
Affiliated Companies	23	33
Accounts Payable:
Accounts Payable	$ 5	$ 2