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Fair Value of Financial Instruments - Derivative Fair Value Measurements (Details) $ in Millions	Sep. 30, 2020 USD ($) $ / MWh	Dec. 31, 2019 USD ($) $ / MWh
Liabilities
Derivative liabilities	$ 813	$ 1,103
Level 3
Liabilities
Derivative liabilities	175	155
Commodity contracts
Assets
Derivative assets	893	1,170
Liabilities
Derivative liabilities	813	1,103
Commodity contracts | Level 3
Assets
Derivative assets	227	193
Liabilities
Derivative liabilities	175	155
Commodity contracts | Level 3 | Power Contracts
Assets
Derivative assets	196	151
Liabilities
Derivative liabilities	$ 167	$ 139
Commodity contracts | Level 3 | Power Contracts | Low
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	10	8
Commodity contracts | Level 3 | Power Contracts | High
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	116	218
Commodity contracts | Level 3 | Power Contracts | Weighted Average
Fair Value Inputs / Range
Forward Market Price (per MWh) | $ / MWh	24	24
Commodity contracts | Level 3 | FTRs
Assets
Derivative assets	$ 31	$ 42
Liabilities
Derivative liabilities	$ 8	$ 16
Commodity contracts | Level 3 | FTRs | Low
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	(50)	(105)
Commodity contracts | Level 3 | FTRs | High
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	43	213
Commodity contracts | Level 3 | FTRs | Weighted Average
Fair Value Inputs / Range
Auction Prices (per MWh) | $ / MWh	0	0

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