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Stock-Based Compensation - Schedule of Options Exercised, Cash Received, and Related Tax Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock options exercised (in shares)	212,546	523,238
Cash received upon exercise	$ 19	$ 43
Related tax benefit realized	$ 7	$ 13

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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