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Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Stockholders' Equity [Member]	Non-controlling Interests [Member]	Total
Balance at Dec. 31, 2017	$ 1	$ 832	$ (3)	$ 251	$ 9	$ 1,090	$ 5,343	$ 6,433
Balance (in shares) at Dec. 31, 2017	71,609,049
Common Stock distributed pursuant to stock incentive plans (in shares)	1,532
Compensation for stock grants vesting in the future		2				2	12	14
Dividends paid to stockholders				(7)		(7)		(7)
Distributions from IBG LLC to noncontrolling interests							(61)	(61)
Comprehensive Income				46	1	47	280	327
Balance at Mar. 31, 2018	$ 1	834	(3)	290	10	1,132	5,574	6,706
Balance (in shares) at Mar. 31, 2018	71,610,581
Balance at Dec. 31, 2018	$ 1	898	(3)	390	(4)	1,282	5,874	7,156
Balance (in shares) at Dec. 31, 2018	75,230,400
Common Stock distributed pursuant to stock incentive plans (in shares)	905
Compensation for stock grants vesting in the future		3				3	13	16
Dividends paid to stockholders				(8)		(8)		(8)
Distributions from IBG LLC to noncontrolling interests							(60)	(60)
Comprehensive Income				49	(1)	48	274	322
Balance at Mar. 31, 2019	$ 1	$ 901	$ (3)	$ 431	$ (5)	$ 1,325	$ 6,101	$ 7,426
Balance (in shares) at Mar. 31, 2019	75,231,305

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Amount of increase to additional paid-in capital (APIC) resulting from recognition of equity-based compensation for restricted stock units.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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