The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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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Fair value amount of debt instrument that was repurchased.

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Face (par) amount of the original debt instrument that was repurchased.

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Contractual rate at which a foreign currency can be purchased or sold.

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For a debtor, the aggregate gain (loss) recognized on the restructuring of payables arises from the difference between the book value of the debt before the restructuring and the fair value of the payments on the debt after restructuring is complete.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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Debt - Senior Notes, Contingent Convertible Senior Notes and Convertible Senior Notes Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($) shares	Dec. 31, 2016 USD ($) $ / €	Dec. 31, 2006 $ / €
Long-Term Debt Instrument [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Debt Instrument, Repurchased Face Amount	$ 908	$ 558
Cash paid to purchase debt	982	472
Long-term Debt, Gross	9,524		$ 10,441
Gains (losses) on purchases or exchanges of debt	$ (7)	100
Convertible Debt [Member] \| Privately Negotiated Exchanges for Common Stock [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		$ 105
Convertible Debt [Member] \| Common Stock [Member]
Long-Term Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued \| shares		17,255,347
Convertible Debt [Member] \| 2.5% Contingent Convertible Senior Notes Due 2037 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Long-term Debt, Gross	$ 15		112
Convertible Debt [Member] \| 2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Debt Instrument, Interest Rate, Effective Percentage	8.00%
Long-term Debt, Gross	$ 8		180
Convertible Debt [Member] \| 5.5% Contingent Convertible Senior Notes Due 2026 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Debt Instrument, Interest Rate, Effective Percentage	11.50%
Long-term Debt, Gross	$ 818		811
Senior Notes [Member] \| 6.25% Euro-Denominated Senior Notes Due 2017 [ Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Long-term Debt, Gross	$ 0		$ 258
Senior Notes [Member] \| 6.25% Euro-Denominated Senior Notes Due 2017 [ Member] \| Cross Currency Interest Rate Contract [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.25%		6.25%
Derivative, Forward Exchange Rate \| $ / €			1.0517	1.3325