Derivative Instruments and Hedging Activities - Schedule of Fair Value Within the Derivative Instrument Valuation on the Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 414	$ 156
Derivative Liabilities	72	360
Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	209	31
Derivative Liabilities	0	27
Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	205	125
Derivative Liabilities	72	333
Interest rate contracts current \| Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	72	2
Derivative Liabilities	0	6
Interest rate contracts current \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	41	17
Derivative Liabilities	0	0
Interest rate contracts long-term \| Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	137	29
Derivative Liabilities	0	21
Interest rate contracts long-term \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	150	94
Derivative Liabilities	0	0
Energy-related commodity contracts current \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	9	10
Derivative Liabilities	11	46
Energy-related commodity contracts long-term \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	5	4
Derivative Liabilities	$ 61	$ 287