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Derivatives (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Cash received for partial settlement of 1.125% Call Option				$ 623	$ 0	$ 0
Cash paid for partial termination of 1.125% Warrants				$ 549	0	$ 0
Convertible debt, converted amount of instrument	$ 16	$ 37	$ 21
1.125% Convertible Notes
Derivative [Line Items]
Percentage of contractual interest rate	1.125%			1.125%
1.125% Call Option
Derivative [Line Items]
Fixed interest rate on derivative	1.125%			1.125%
1.125% Call Option | Current assets
Derivative [Line Items]
Derivative asset	$ 476			$ 476	522
1.125% Conversion Option
Derivative [Line Items]
Cash received for partial settlement of 1.125% Call Option	$ 146	343	134
Fixed interest rate on derivative	1.125%			1.125%
1.125% Conversion Option | Current liabilities
Derivative [Line Items]
Derivative liability	$ 476			$ 476	$ 522
1.125% Warrants
Derivative [Line Items]
Cash paid for partial termination of 1.125% Warrants	$ 130	$ 306	$ 113

X

- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fixed interest rate related to the interest rate derivative.

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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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The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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