Common Stock - Narrative (Details) - USD ($)	May 31, 2019	May 14, 2019	May 02, 2019	Feb. 19, 2019
February 2019 ASR
Accelerated Share Repurchases [Line Items]
Accelerated stock repurchase program, shares to be repurchased, dollar amount				$ 700,000,000
May 2019 ASR
Accelerated Share Repurchases [Line Items]
Accelerated stock repurchase program, shares to be repurchased, dollar amount		$ 500,000,000	$ 200,000,000
Accelerated Share Repurchase Program
Accelerated Share Repurchases [Line Items]
Stock repurchase program, shares authorized	$ 400,000,000