Income Tax Expense (Components of Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	$ 589	$ 1,049	$ 430
Federal	18	152	16
State	(1)	37	7
Current Foreign Tax Expense (Benefit)	7	0	0
Total current income tax expense	24	189	23
Federal	22	(19)	9
State	(8)	5	4
Deferred Foreign Income Tax Expense (Benefit)	24	0	0
Total deferred tax expense (benefit)	38	(14)	13
Income tax expense	62	175	36
Cash paid for federal tax credits purchased from non-governmental third parties	41	47	0
Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	3	135	29
Federal | Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	(68)	105	21
PENNSYLVANIA | Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	2	7	2
Other states | Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	3	11	3
CANADA | Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	62	0	0
NEW JERSEY | Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	2	12	3
Other Foreign | Excluding federal tax credits purchased from non-governmental third parties
Effective Income Tax Rate Reconciliation [Line Items]
Income Taxes Paid, Net	2	0	0
UNITED STATES
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	397	1,040	430
Non-US
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax	$ 192	$ 9	$ 0