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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Sep. 30, 2023 USD ($) $ / MMBTU $ / MWh	Dec. 31, 2022 USD ($) $ / MWh
Liabilities
Derivative liabilities	$ 4,680	$ 8,441
Commodity contracts
Assets
Derivative assets	6,196	11,976
Liabilities
Derivative liabilities	4,551	8,439
Interest rate contracts
Assets
Derivative assets	32
Level 3
Assets
Derivative assets	809	1,251
Liabilities
Derivative liabilities	516	746
Level 3 | Commodity contracts
Assets
Derivative assets	809	1,251
Liabilities
Derivative liabilities	388	746
Level 3 | Commodity contracts | Natural Gas Contracts
Assets
Derivative assets	94	340
Liabilities
Derivative liabilities	$ 113	$ 448
Level 3 | Commodity contracts | Natural Gas Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	1,000,000	2
Level 3 | Commodity contracts | Natural Gas Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	16,000,000	48
Level 3 | Commodity contracts | Natural Gas Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	3	6
Level 3 | Commodity contracts | Power Contracts
Assets
Derivative assets	$ 683	$ 843
Liabilities
Derivative liabilities	$ 222	$ 216
Level 3 | Commodity contracts | Power Contracts | Low | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	1,000,000	3
Level 3 | Commodity contracts | Power Contracts | High | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	196,000,000	431
Level 3 | Commodity contracts | Power Contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Forward Market Price (perMMBtu) or (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input | $ / MWh	43	48
Level 3 | Commodity contracts | FTRs
Assets
Derivative assets	$ 32	$ 68
Liabilities
Derivative liabilities	$ 53	$ 82
Level 3 | Commodity contracts | FTRs | Low | Valuation Technique, Discounted Cash Flow | Auction Prices (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	(30,000,000)	(32)
Level 3 | Commodity contracts | FTRs | High | Valuation Technique, Discounted Cash Flow | Auction Prices (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	190,000,000	610
Level 3 | Commodity contracts | FTRs | Weighted Average | Valuation Technique, Discounted Cash Flow | Auction Prices (per MWh)
Fair Value Inputs / Range
Derivative asset/liability, measurement input	1	0
Level 3 | Interest rate contracts
Assets
Derivative assets	$ 0
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0200
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0600
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0300
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.6000
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0295
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Credit Loss Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.1224
Level 3 | Interest rate contracts | Consumer financing program
Assets
Derivative assets	$ 0
Liabilities
Derivative liabilities	$ 128
Level 3 | Interest rate contracts | Consumer financing program | Low | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0094
Level 3 | Interest rate contracts | Consumer financing program | High | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.9985
Level 3 | Interest rate contracts | Consumer financing program | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Default Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0766

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