Income Taxes - Components of Deferred Income Tax (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets
Net operating loss (NOL) carryforwards	$ 284	$ 250
Lease liabilities	260	265
Contract liabilities	61	63
Interest expense carryforwards	133	74
Asset retirement obligation	123	116
Other	98	129
Total deferred tax assets	959	897
Less valuation allowance	(216)	(177)
Net deferred tax assets	743	720
Deferred tax liabilities
Property, plant and equipment	841	805
Licenses/intangibles	410	419
Partnership investments	181	173
Lease assets	242	245
Other	44	43
Total deferred tax liabilities	1,718	1,685
Net deferred income tax liability	975	965
Other assets and deferred charges
Deferred tax liabilities
Net deferred income tax liability	0	(4)
Deferred income tax liability, net
Deferred tax liabilities
Net deferred income tax liability	$ 975	$ 969