Acquisitions and Strategic Investments Strategic Investments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Other Nonoperating Income (Expense)	$ 156	$ (124)	$ (37)
Equity Method Investments	303	209
Cost Method Investments	94	81
Available-for-sale Securities	0	15
Notes Receivable From Portfolio Companies	26	47
Investments	424	353
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 334	$ 212

Notes Receivable From Portfolio Companies

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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

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Amount of income (expense) related to nonoperating activities, classified as other.

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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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