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Divestiture of Controlling Interest in Subsidiary, Percentage Sold

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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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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Divestitures (Narrative) (Details) - USD ($)			3 Months Ended	12 Months Ended
Divestitures (Narrative) (Details) - USD ($)	Jul. 31, 2017	Feb. 01, 2017	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments				$ 95,000,000	$ 0	$ 0
Decrese in noncontrolling interest as a result of divestiture				33,000,000
Proceeds from sale of businesses					1,307,000,000	0
Disposal Group, Held-for-sale, Not Discontinued Operations \| Brazilian Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments			$ 95,000,000
Pre-tax (loss) gain on sale of businesses			(12,000,000)
Decrese in noncontrolling interest as a result of divestiture			90,000,000
Increase to additional paid in capital from as a result of divestitures			$ 57,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Capco Consulting Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage (percent)	40.00%
Pre-tax (loss) gain on sale of businesses	$ (41,000,000)
Proceeds from sale of businesses	$ 469,000,000
Ownership percentage by non-controlling interest	60.00%
Preferred unit dividend rate	12.00%
Pre-tax earnings					14,000,000	55,000,000
Equity method investments	$ 172,000,000			$ 151,000,000	171,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| PS&E
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses		$ 500,000,000
Pre-tax earnings					$ 3,000,000	$ 42,000,000
Consideration received		850,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| PS&E \| Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax (loss) gain on sale of businesses		$ 85,000,000
Cardinal Member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage (percent)				38.00%	40.00%
Banco Bradesco \| Brazilian Venture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage (percent)				100.00%