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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Jun. 30, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($) $ / MWh
Liabilities
Commodity contracts	$ 10,565	$ 4,799
Level 3
Liabilities
Commodity contracts	875	164
Commodity contracts
Assets
Derivative assets	15,865	7,139
Liabilities
Commodity contracts	10,565	4,798
Commodity contracts | Level 3
Assets
Derivative assets	2,278	457
Liabilities
Commodity contracts	875	164
Commodity contracts | Level 3 | Natural Gas Contracts
Assets
Derivative assets	55	16
Liabilities
Commodity contracts	$ 56	$ 1
Commodity contracts | Level 3 | Natural Gas Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	3	3
Commodity contracts | Level 3 | Natural Gas Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	17	40
Commodity contracts | Level 3 | Natural Gas Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	5	15
Commodity contracts | Level 3 | Power Contracts
Assets
Derivative assets	$ 2,144	$ 392
Liabilities
Commodity contracts	$ 762	$ 121
Commodity contracts | Level 3 | Power Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	7	3
Commodity contracts | Level 3 | Power Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	263	212
Commodity contracts | Level 3 | Power Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	56	35
Commodity contracts | Level 3 | FTRs
Assets
Derivative assets	$ 79	$ 49
Liabilities
Commodity contracts	$ 57	$ 42
Commodity contracts | Level 3 | FTRs | Low
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	(307)	(122)
Commodity contracts | Level 3 | FTRs | High
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	75	43
Commodity contracts | Level 3 | FTRs | Weighted Average
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	1	0

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