Equity and Equity Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
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)	$ 26.37	$ 24.14
Number of shares authorized for issuance under the Plan (shares)	163,000,000
Capital shares reserved for future issuance (shares)	25,000,000
Share-based compensation	$ 161	$ 159	$ 169
Compensation cost not yet recognized	$ 94
Unvested restricted stock awards (shares)	2,600,000
Outstanding stock option awards (shares)	3,900,000
Outstanding stock option awards exercisable, weighted average exercise price (usd per share)	$ 49.57
Number of exercisable stock option awards (shares)	1,400,000
Excess tax benefits	$ 1	$ 7

Capital stock, shares authorized.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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

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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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Amount of noncash expense for share-based payment arrangement.

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

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

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

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