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Stock-based Compensation (Schedule of Stock Option Exercises) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stock Option Aggregate Disclosures [Abstract]
Intrinsic value of stock options exercised	$ 48	$ 138
Cash received from option exercises	33	72
Treasury shares repurchased for employee payroll taxes	(8)	(22)
Tax benefit realized from option exercises	11	34
Aggregate grant-date fair value of stock options vested	$ 14	$ 15

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
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Amount of cash inflow from exercise of option under share-based payment arrangement.

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