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Stock-Based Compensation - Summary of Stock Options Exercised (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Options exercised (in shares)	1,171,786	770,597	840,175
Total intrinsic value	$ 144	$ 86	$ 72
Cash received upon exercise	98	53	58
Related tax benefits realized	$ 29	$ 18	$ 16

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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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