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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Jun. 30, 2020 USD ($) $ / MWh	Dec. 31, 2019 USD ($) $ / MWh
Liabilities
Derivative liabilities	$ 1,027	$ 1,103
Level 3
Liabilities
Derivative liabilities	314	155
Commodity contracts
Assets
Derivative assets	1,230	1,170
Liabilities
Derivative liabilities	1,027	1,103
Commodity contracts | Level 3
Assets
Derivative assets	466	193
Liabilities
Derivative liabilities	314	155
Commodity contracts | Level 3 | Power Contracts
Assets
Derivative assets	431	151
Liabilities
Derivative liabilities	$ 306	$ 139
Commodity contracts | Level 3 | Power Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	4	8
Commodity contracts | Level 3 | Power Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	181	218
Commodity contracts | Level 3 | Power Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	26	24
Commodity contracts | Level 3 | FTRs
Assets
Derivative assets	$ 35	$ 42
Liabilities
Derivative liabilities	$ 8	$ 16
Commodity contracts | Level 3 | FTRs | Low
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	(55)	(105)
Commodity contracts | Level 3 | FTRs | High
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	48	213
Commodity contracts | Level 3 | FTRs | Weighted Average
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	0	0

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