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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets
Total	$ 639	$ 636
Liabilities
Total	238	271
Interest rate swaps
Assets
Derivative assets	302	245
Liabilities
Derivative liabilities	43	102
Natural gas supply contracts
Assets
Derivative assets	91	51
Liabilities
Derivative liabilities	195	169
Level 1
Assets
Total	246	340
Liabilities
Total	0	0
Level 1 | Interest rate swaps
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Level 1 | Natural gas supply contracts
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Level 2
Assets
Total	303	246
Liabilities
Total	46	122
Level 2 | Interest rate swaps
Assets
Derivative assets	302	245
Liabilities
Derivative liabilities	43	102
Level 2 | Natural gas supply contracts
Assets
Derivative assets	1	1
Liabilities
Derivative liabilities	3	20
Level 3
Assets
Total	90	50
Liabilities
Total	192	149
Level 3 | Interest rate swaps
Assets
Derivative assets	0	0
Liabilities
Derivative liabilities	0	0
Level 3 | Natural gas supply contracts
Assets
Derivative assets	90	50
Liabilities
Derivative liabilities	192	149
Money market funds
Assets
Money market funds	246	340
Money market funds | Level 1
Assets
Money market funds	246	340
Money market funds | Level 2
Assets
Money market funds	0	0
Money market funds | Level 3
Assets
Money market funds	$ 0	$ 0

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