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Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | $ (186) | $ (92)
Fair Value of gross derivative assets/(liabilities), net | (186) | (92)
Derivative asset fair value gross liability net of derivative liability fair value gross asset | 0 | 0
Derivative asset, fair value, amount offset against collateral net of derivative liability, fair value, amount offset against collateral | (186) | (92)
Derivatives Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (21) | (14)
Derivatives Not Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (165) | (78)
Interest rate contracts current | Derivatives Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (7) | (3)
Interest rate contracts current | Derivatives Not Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (29) | (13)
Interest rate contracts long-term | Derivatives Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (14) | (11)
Interest rate contracts long-term | Derivatives Not Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (119) | (56)
Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (17) | (9)
Derivative liability, fair value, gross asset | 0 | (1)
Derivative liability | (17) | (10)
Fair Value of gross derivative assets/(liabilities), net | (17) | (9)
Derivative asset fair value gross liability net of derivative liability fair value gross asset | 0 | (1)
Derivative asset, fair value, amount offset against collateral net of derivative liability, fair value, amount offset against collateral | (17) | (10)
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | (169) | (83)
Derivative liability, fair value, gross asset | 0 | 1
Derivative liability | (169) | (82)
Fair Value of gross derivative assets/(liabilities), net | (169) | (83)
Derivative asset fair value gross liability net of derivative liability fair value gross asset | 0 | 1
Derivative asset, fair value, amount offset against collateral net of derivative liability, fair value, amount offset against collateral | (169) | (82)
Commodity contracts long-term | Derivatives Not Designated as Cash Flow Hedges: |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross | $ (17) | $ (9)

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