Capital stock, shares authorized.

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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- Definition

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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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- 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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- Definition

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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- Definition

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

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity and Equity Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Capital stock, shares authorized (shares)	2,000,000,000.0
Common stock, shares authorized (shares)	1,500,000,000	1,500,000,000
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (shares)	500,000,000
Treasury stock weighted average cost per share (usd per share)	$ 28.23	$ 26.37
Number of shares authorized for issuance under the Plan (shares)	163,000,000
Capital shares reserved for future issuance (shares)	21,000,000
Equity compensation expense	$ 119	$ 161	$ 159
Compensation cost not yet recognized	$ 80
Outstanding stock option awards (shares)	5,400,000
Outstanding stock option awards exercisable, weighted average exercise price (usd per share)	$ 52.37
Number of exercisable stock option awards (shares)	2,400,000
Restricted stock awards
Class of Stock [Line Items]
Unvested restricted stock awards (shares)	2,200,000
Stock options
Class of Stock [Line Items]
Term of award (in years)	10 years
Delta Common Stock Warrants
Class of Stock [Line Items]
Number shares called by warrants (in shares)	6,700,000