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Employee Benefit Plans (Schedule of Stock Option Activity) (Details) - Stock Options - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (in shares)	11
Granted (in shares)	2	1	1
Exercised (in shares)	(5)
Cancelled (in shares)	0
Ending balance (in shares)	8	11
Options exercisable (shares)	6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (weighted average exercise price)	$ 76.01
Granted (weighted average exercise price)	120.47	$ 113.48	$ 96.49
Exercised (weighted average exercise price)	68.14
Cancelled (weighted average exercise price)	115.47
Ending balance (weighted average exercise price)	88.01	$ 76.01
Options exercisable (weighted average exercise price)	$ 75.35
Weighted Average Remaining Contractual Term (Years)	3 years 9 months 18 days	4 years 4 months 24 days
Weighted average remaining contractual term, options exercisable (years)	2 years 9 months 18 days
Aggregate intrinsic value	$ 464	$ 745
Aggregate intrinsic value, exercised	348	$ 189	$ 257
Aggregate intrinsic value, options exercisable	$ 381

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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