Strategic Investments (Details) - USD ($) $ in Millions	Jan. 24, 2018	Sep. 30, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		$ 321
Equity method investments		291	$ 209
Measurement alternative investments		73	81
Publicly-held securities		1	15
Notes receivable		19	47
Investments		384	$ 353
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 780
Millipede [Member]
Schedule of Investments [Line Items]
Business Combination, Consideration Transferred	$ 90
Closing payment	325
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 125

Closing payment

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of investment in equity security without readily determinable fair value.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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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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