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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Sep. 30, 2021 USD ($) $ / MWh	Dec. 31, 2020 USD ($) $ / MWh
Liabilities
Commodity contracts	$ 7,521	$ 884
Level 3
Liabilities
Commodity contracts	252	155
Commodity contracts
Assets
Derivative assets	11,198	821
Liabilities
Commodity contracts	7,521	884
Commodity contracts | Level 3
Assets
Derivative assets	563	139
Liabilities
Commodity contracts	252	155
Commodity contracts | Level 3 | Natural Gas Contracts
Assets
Derivative assets	19
Liabilities
Commodity contracts	$ 3
Commodity contracts | Level 3 | Natural Gas Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	3
Commodity contracts | Level 3 | Natural Gas Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	49
Commodity contracts | Level 3 | Natural Gas Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	19
Commodity contracts | Level 3 | Power Contracts
Assets
Derivative assets	$ 512	111
Liabilities
Commodity contracts	$ 218	$ 143
Commodity contracts | Level 3 | Power Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	3	10
Commodity contracts | Level 3 | Power Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	263	105
Commodity contracts | Level 3 | Power Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	40	21
Commodity contracts | Level 3 | FTRs
Assets
Derivative assets	$ 32	$ 28
Liabilities
Commodity contracts	$ 31	$ 12
Commodity contracts | Level 3 | FTRs | Low
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	(131)	(28)
Commodity contracts | Level 3 | FTRs | High
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	755	43
Commodity contracts | Level 3 | FTRs | Weighted Average
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	0	0

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