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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

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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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 60 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15743-112638 + Details
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