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Equity-Based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Units (in shares):
Nonvested beginning of period (in shares)	209,378
Grants (in shares)	66,685
Vested (in shares)	(172,691)
Forfeited (in shares)	(10,936)
Nonvested end of period (in shares)	92,436	209,378
Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value (in dollars per share):
Beginning nonvested, weighted average grant date fair value (in dollars per share)	$ 75.56
Granted, weighted average grant date fair value (in dollars per share)	112.55	$ 103.24	$ 73.95
Vested, weighted average grant date fair value (in dollars per share	68.78
Forfeited, weighted average grant date fair value (in dollars per share	86.16
Ending nonvested, weighted average grant date fair value (in dollars per share)	$ 107.88	$ 75.56
Vested in period, fair value (less than)	$ 12	$ 4	$ 2

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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