Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended				9 Months Ended
	Jul. 31, 2019 $ / shares	Dec. 31, 2019 USD ($) vote $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares	Dec. 31, 2019 USD ($) vote $ / shares	Dec. 31, 2018 $ / shares	May 31, 2019 USD ($)
Accelerated Share Repurchases [Line Items]
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote		1				1
Dividends declared per common share (in dollars per share) | $ / shares	$ 0.41	$ 0.41		$ 0.39	$ 0.39	$ 1.21	$ 1.12
Accelerated Share Repurchase
Accelerated Share Repurchases [Line Items]
Authorized repurchase amount (up to) | $								$ 600,000,000
Common stock repurchased (in shares) | shares				4.7
Average price per share of shares repurchased (in dollars per share) | $ / shares				$ 127.68
Authorized amount available for future repurchases | $		$ 1,500,000,000				$ 1,500,000,000
Open Market Transactions
Accelerated Share Repurchases [Line Items]
Common stock repurchased (in shares) | shares		3.4	5.2	0.7
Value of shares repurchased under the ASR program | $		$ 500,000,000	$ 750,000,000	$ 84,000,000
Average price per share of shares repurchased (in dollars per share) | $ / shares		$ 148.39	$ 144.28	$ 128.64