Stockholders' Equity - Repurchase Program (Details)			3 Months Ended						9 Months Ended		56 Months Ended
	Feb. 20, 2020 transaction $ / shares shares	Dec. 18, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) shares	Oct. 22, 2020 USD ($)
Class of Stock [Line Items]
Shares repurchased			$ 238,396,000	$ 32,230,000	$ 530,237,000	$ 58,336,000	$ 702,000	$ 3,322,000
Repurchase of common stock									$ 788,409,000	$ 59,362,000
Program
Class of Stock [Line Items]
Shares repurchased (in shares) | shares											14,435,566
Shares repurchased											$ 3,000,000,000.0
Program | Common Stock
Class of Stock [Line Items]
Remaining authorized repurchase amount			$ 1,060,000,000.00						$ 1,060,000,000.00		$ 1,060,000,000.00
Program | Common Stock | Subsequent Event
Class of Stock [Line Items]
Increase in authorized amount to be repurchased												$ 1,000,000,000
Stock repurchase program, approved amount												$ 4,100,000,000
2019 ASR Agreement
Class of Stock [Line Items]
Shares repurchased (in shares) | shares	175,340	1,431,989
Repurchase of common stock		$ 500,000,000
Initial price paid (in dollars per share) | $ / shares		$ 285.70
Final price paid (in dollars per share) | $ / shares	$ 311.08
Number of transactions | transaction	2
2019 ASR Agreement | Common Stock
Class of Stock [Line Items]
Stock repurchase program, approved amount		$ 500,000,000