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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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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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