Accumulated Other Comprehensive Income AOCI by Component (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Beginning Balance	$ 581	$ 234
Other comprehensive income (loss), net before reclassifications	1	1
Reclassification from AOCI, Current Period, Tax	3	2
Ending Balance	570	227
Equity Method Investments
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Beginning Balance	9	8
Other comprehensive income (loss), net before reclassifications	1	1
Reclassification from AOCI, Current Period, Tax	0	0
Ending Balance	10	9
Pension and Retiree Health and Welfare Benefit Items
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Beginning Balance	572	226
Other comprehensive income (loss), net before reclassifications	0	0
Reclassification from AOCI, Current Period, Tax	3	2
Ending Balance	560	218
Amortization of actuarial (gains) losses
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Amortization of actuarial (gains) losses	(15)	(10)
Amortization of actuarial (gains) losses \| Equity Method Investments
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Amortization of actuarial (gains) losses	0	0
Amortization of actuarial (gains) losses \| Pension and Retiree Health and Welfare Benefit Items
Other Comprehensive Income (Loss) Net of Tax, Period Change [Abstract]
Amortization of actuarial (gains) losses	$ (15)	$ (10)

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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+ Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

+ References

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+ Details