Debt - Long-Term Debt - Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2020	Sep. 30, 2018
Notes Due 2028
Debt Instrument [Line Items]
Principal amount		$ 500
Interest rate		4.45%
Proceeds from debt, net of issuance costs		$ 495
Debt issuance costs		$ 5
Redemption price, percentage		100.00%
Control triggering percentage		101.00%
Notes Due 2030
Debt Instrument [Line Items]
Principal amount	$ 650
Interest rate	1.95%
Proceeds from debt, net of issuance costs	$ 642
Redemption price, percentage	100.00%
Control triggering percentage	101.00%
Debt discount	$ 8