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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

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.

+ References

No definition available.

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

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

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

+ References

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Debt - Senior Notes and Contingent Convertible Senior Notes Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Long-Term Debt Instrument [Line Items]
Cash paid to purchase debt	$ 472	$ 0
Long-term Debt, Gross	10,405		$ 10,692
Gain (Loss) on Repurchase of Debt Instrument	100
Senior Notes [Member] \| 3.25% Senior Notes due 2016 [Member]
Long-Term Debt Instrument [Line Items]
Cash paid to purchase debt	$ 259
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Debt Instrument, Repurchased Face Amount	$ 122
Debt Instrument, Repurchase Amount	115
Long-term Debt, Gross	$ 0		381
Senior Notes [Member] \| 2.5% Contingent Convertible Senior Notes due 2037 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.50%
Long-term Debt, Gross	$ 846		1,027
Senior Notes [Member] \| 6.5% Senior Notes Due 2017 [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Debt Instrument, Repurchased Face Amount	$ 59
Debt Instrument, Repurchase Amount	36
Long-term Debt, Gross	379		$ 453
Senior Notes [Member] \| 6.5% Senior Notes Due 2017 [Member] \| Convertible Debt [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 15
Senior Notes [Member] \| Common Stock [Member] \| 6.5% Senior Notes Due 2017 [Member]
Long-Term Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	2,555,979
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, Repurchased Face Amount	$ 118
Debt Instrument, Repurchase Amount	63
Convertible Debt [Member] \| 2.5% Contingent Convertible Senior Notes due 2037 [Member] \| Convertible Debt [Member]
Long-Term Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount	$ 90
Convertible Debt [Member] \| Common Stock [Member] \| 2.5% Contingent Convertible Senior Notes due 2037 [Member]
Long-Term Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	14,699,368