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Divestiture of Controlling Interest in Subsidiary, Percentage Sold

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Amount before tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until its disposal.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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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.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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The percentage rate used to calculate dividend payments on preferred stock.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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The number of positions eliminated during the period as a result of restructuring activities.

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Divestitures and Discontinued Operations (Narrative) (Details) $ in Millions			3 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($)	Feb. 01, 2017 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2017 USD ($) claim	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2011 employee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses				$ 1,307	$ 0	$ 241
Gain on sale of assets, net				62	0	149
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Capco Consulting Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses	$ 469
Pre-tax gin on sale of businesses	$ (41)
Ownership percentage by non-controlling interest	60.00%
Pre-tax earnings				14	55	60
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| SunGard Public Sector and Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses		$ 500
Pre-tax earnings				3	42	6
Consideration received		850
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| SunGard Public Sector and Education [Member] \| Minimum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gin on sale of businesses		$ 85
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Other Nonoperating Income (Expense) [Member] \| Gaming Industry Check Warranty Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of assets, net			$ 139
Discontinued Operations, Disposed of by Sale [Member] \| Participacoes Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings (losses) before taxes				$ 0	$ 2	$ (5)
Number of employees terminated \| employee							2,600
Number of active claims \| claim				320
Discontinued Operations, Disposed of by Sale [Member] \| Participacoes Operations [Member] \| Pending litigation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Court ordered deposits on potential future labor claims				$ 9
Accrued liability for labor claims				$ 9
Discontinued Operations, Disposed of by Sale [Member] \| Participacoes Operations [Member] \| Pending litigation [Member] \| Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period from termination date employees can file claims							2 years
Capco Consulting Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage	40.00%
Preferred unit dividend rate	12.00%
Equity method investments	$ 172