Share-Based Compensation - Nonvested Restricted Stock Activity (Details) - Restricted Stock - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Number of Restricted Shares (in thousands)
Non-vested beginning balance (in shares)	3,728
Granted (in shares)	1,464
Vested (in shares)	(1,986)
Forfeited (in shares)	(83)
Non-vested ending balance (in shares)	3,123
Weighted Average Grant-Date Fair Value per Share
Non-vested beginning balance (in dollars per share)	$ 68.87
Granted (in dollars per share)	93.18
Vested (in dollars per share)	64.94
Forfeited (in dollars per share)	77.04
Non-vested ending balance (in dollars per share)	$ 82.55
Granted (in shares)	1,464
Total fair value of restricted stock vested under all restricted stock plans	$ 180	$ 166
Time Based Restricted Units
Number of Restricted Shares (in thousands)
Granted (in shares)	891	975
Weighted Average Grant-Date Fair Value per Share
Granted (in shares)	891	975

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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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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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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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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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