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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 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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