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Stock-Based Compensation - Schedule of Options Exercised, Cash Received, and Related Tax Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Options exercised (in shares)	128,934	162,400	341,480	685,638
Cash received upon exercise	$ 12	$ 12	$ 31	$ 55
Related tax benefit realized	$ 5	$ 3	$ 12	$ 16

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