Fair Value Measurements - Interest Rage Swap Derivatives (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Derivative, notional amount	$ 3,000
Designated as Hedging Instrument | Interest Rate Swap at 2.274%
Derivative [Line Items]
Derivative, notional amount	$ 250
Derivative, Fixed Interest Rate	2.274%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2022
Designated as Hedging Instrument | Interest Rate Swap at 2.828%
Derivative [Line Items]
Derivative, notional amount	$ 200
Derivative, Fixed Interest Rate	2.828%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2022
Designated as Hedging Instrument | Interest Rate Swap at 2.739%
Derivative [Line Items]
Derivative, notional amount	$ 600
Derivative, Fixed Interest Rate	2.739%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2022
Designated as Hedging Instrument | Interest Rate Swap at 2.153%
Derivative [Line Items]
Derivative, notional amount	$ 250
Derivative, Fixed Interest Rate	2.153%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2020
Designated as Hedging Instrument | Interest Rate Swap at 2.196%
Derivative [Line Items]
Derivative, notional amount	$ 250
Derivative, Fixed Interest Rate	2.196%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2021
Designated as Hedging Instrument | Interest Rate Swap at 2.788%
Derivative [Line Items]
Derivative, notional amount	$ 400
Derivative, Fixed Interest Rate	2.788%
Derivative, Variable Interest Rate	1.702%
Derivative, Maturity Date	Dec. 31, 2021
Designated as Hedging Instrument | Interest Rate Swap at 2.828%
Derivative [Line Items]
Derivative, notional amount	$ 200
Derivative, Fixed Interest Rate	2.828%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2022
Designated as Hedging Instrument | Interest Rate Swap at 2.172%
Derivative [Line Items]
Derivative, notional amount	$ 250
Derivative, Fixed Interest Rate	2.172%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2020
Designated as Hedging Instrument | Interest Rate Swap at 2.731%
Derivative [Line Items]
Derivative, notional amount	$ 200
Derivative, Fixed Interest Rate	2.731%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2020
Designated as Hedging Instrument | Interest Rate Swap at 2.707%
Derivative [Line Items]
Derivative, notional amount	$ 400
Derivative, Fixed Interest Rate	2.707%
Derivative, Variable Interest Rate	1.691%
Derivative, Maturity Date	Dec. 31, 2021