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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Mar. 31, 2023 USD ($) $ / MWh	Dec. 31, 2022 USD ($) $ / MWh
Liabilities
Derivative liabilities	$ 6,243	$ 8,441
Commodity contracts
Assets
Derivative assets	7,725	11,976
Liabilities
Derivative liabilities	6,116	8,439
Interest rate contracts
Assets
Derivative assets	10
Liabilities
Derivative liabilities	15
Level 3
Assets
Derivative assets	1,034	1,251
Liabilities
Derivative liabilities	674	746
Level 3 | Commodity contracts
Assets
Derivative assets	1,034	1,251
Liabilities
Derivative liabilities	563	746
Level 3 | Commodity contracts | Natural Gas Contracts
Assets
Derivative assets	152	340
Liabilities
Derivative liabilities	$ 196	$ 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 | $ / MWh	1	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 | $ / MWh	17	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 | $ / MWh	4	6
Level 3 | Commodity contracts | Power Contracts
Assets
Derivative assets	$ 827	$ 843
Liabilities
Derivative liabilities	$ 292	$ 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	2	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	326	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	45	48
Level 3 | Commodity contracts | FTRs
Assets
Derivative assets	$ 55	$ 68
Liabilities
Derivative liabilities	$ 75	$ 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)	(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	145	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	0	0
Level 3 | Interest rate contracts
Assets
Derivative assets	$ 0
Liabilities
Derivative liabilities	$ 0
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rate
Fair Value Inputs / Range
Derivative liability, measurement input	0.0200
Level 3 | Interest rate contracts | Low | Valuation Technique, Discounted Cash Flow | Loss Severity Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.0600
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rate
Fair Value Inputs / Range
Derivative liability, measurement input	0.0300
Level 3 | Interest rate contracts | High | Valuation Technique, Discounted Cash Flow | Loss Severity Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.3600
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Prepayment Rate
Fair Value Inputs / Range
Derivative liability, measurement input	0.0287
Level 3 | Interest rate contracts | Weighted Average | Valuation Technique, Discounted Cash Flow | Loss Severity Rates
Fair Value Inputs / Range
Derivative liability, measurement input	0.1088
Level 3 | Interest rate contracts | Consumer Financing Program
Assets
Derivative assets	$ 0
Liabilities
Derivative liabilities	$ 111
Level 3 | Interest rate contracts | Consumer Financing Program | Low | Valuation Technique, Discounted Cash Flow | Collateral Default Rate
Fair Value Inputs / Range
Derivative liability, measurement input	0.0180
Level 3 | Interest rate contracts | Consumer Financing Program | High | Valuation Technique, Discounted Cash Flow | Collateral Default Rate
Fair Value Inputs / Range
Derivative liability, measurement input	0.5250
Level 3 | Interest rate contracts | Consumer Financing Program | Weighted Average | Valuation Technique, Discounted Cash Flow | Collateral Default Rate
Fair Value Inputs / Range
Derivative liability, measurement input	0.0616

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