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Subsequent Events (Details) € in Millions, $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 31, 2018 USD ($)	Oct. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017	Oct. 18, 2018 € / $	Sep. 13, 2018 kr / $
Subsequent Event [Line Items]
Reduction of revenue				$ (964)	$ (965)	$ (3,141)	$ (2,929)
Proceeds from sale of noncontrolling interests						$ 286	$ 0
SEK exchange rate | kr / $										8.96
Subsequent Event
Subsequent Event [Line Items]
SEK exchange rate | € / $									0.87
LCH
Subsequent Event [Line Items]
Ownership percentage						5.00%		5.00%
LCH | Subsequent Event
Subsequent Event [Line Items]
Ownership percentage	5.00%	5.00%
Proceeds from sale of noncontrolling interests	$ 171	€ 148
Restatement Adjustment | Scenario, Forecast
Subsequent Event [Line Items]
Reduction of revenue			$ 1

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- Definition

Equity Securities without Readily Determinable Fair Value, Ownership Percentage

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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