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Hedges and Derivative Financial Instruments - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |
Net hedge ineffectiveness gain (loss) |  | $ 0
Derivatives accounted for as hedges |  |
Derivative [Line Items] |  |
Cash flow hedges, gain (loss) recognized including AOCI | $ 22,000,000 |
Derivatives accounted for as hedges | Interest rate derivatives |  |
Derivative [Line Items] |  |
Notional amount | $ 1,275,000,000 | $ 0

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