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Debt - Long-Term Debt Table (Details) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 USD ($) $ / shares $ / € | Dec. 31, 2015 USD ($) $ / € | Dec. 31, 2006 $ / €
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 9,425 | $ 9,706 |
Long-term debt, current maturities including discount | (344) | (381) |
Long-term Debt, Fair Value | 9,081 | 9,325 |
Long-term Debt, Gross | 10,405 | 10,692 |
Deferred Long-term Liability Charges | (38) | (43) |
Current maturities of long-term debt, net | (343) | (381) |
Long-term debt, net | $ 10,062 | 10,311 |
Commitment Period | 10 years |  |
Debt Instrument, Unamortized Discount | $ (3) | (4) |
Revolving Credit Facility [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 367 |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 367 | 0 |
Long-term Debt, Gross | $ 367 | 0 |
Convertible Debt [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Percentage Of Principal Amount Of Notes For Repurchase Requirement Of Contingent Convertible Senior Notes | 100.00% |  |
Commitment Period | 10 years |  |
Debt Instrument, Convertible, Terms of Conversion Feature | 5 days |  |
Debt Instrument, Unamortized Discount | $ (103) | (133) |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |
Convertible Debt [Member] | Debt Instrument, Redemption, Period One [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Commitment Period | 5 years |  |
Convertible Debt [Member] | Debt Instrument, Redemption, Period Two [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Commitment Period | 10 years |  |
Convertible Debt [Member] | Debt Instrument, Redemption, Period Three [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Commitment Period | 15 years |  |
Convertible Debt [Member] | Debt Instrument, Redemption, Period Four [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Commitment Period | 20 years |  |
Interest Rate Contract [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 0 | 0 |
Long-term Debt, Gross | 7 | 7 |
3.25% Senior Notes due 2016 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 0 | 381 |
Long-term Debt, Gross | $ 0 | 381 |
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |  |
6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 344 | 329 |
Long-term Debt, Gross | $ 344 | $ 329 |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |
6.25% Euro-Denominated Senior Notes Due 2017 [ Member] | Cross Currency Interest Rate Contract [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Derivative, Forward Exchange Rate | $ / € | 1.1380 | 1.0862 | 1.3325
Debt Instrument, Interest Rate, Stated Percentage | 6.25% | 6.25% |
6.5% Senior Notes Due 2017 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 379 | $ 453 |
Long-term Debt, Gross | $ 379 | 453 |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |
7.25% Senior Notes Due 2018 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 538 | 538 |
Long-term Debt, Gross | $ 538 | 538 |
Debt Instrument, Interest Rate, Stated Percentage | 7.25% |  |
Floating Rate Senior Notes due 2019 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 1,104 | 1,104 |
Long-term Debt, Gross | 1,104 | 1,104 |
6.625% Senior Notes Due 2020 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 822 | 822 |
Long-term Debt, Gross | $ 822 | 822 |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |
6.875% Senior Notes Due 2020 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 304 | 304 |
Long-term Debt, Gross | $ 304 | 304 |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |  |
6.125% Senior Notes Due 2021 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 589 | 589 |
Long-term Debt, Gross | $ 589 | 589 |
Debt Instrument, Interest Rate, Stated Percentage | 6.125% |  |
5.375% Senior Notes due 2021 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 286 | 286 |
Long-term Debt, Gross | $ 286 | 286 |
Debt Instrument, Interest Rate, Stated Percentage | 5.375% |  |
4.875% Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 639 | 639 |
Long-term Debt, Gross | $ 639 | 639 |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% |  |
8.00% Senior Secured Second Lien Notes Due 2022 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 2,425 | 2,425 |
Long-term Debt, Gross | $ 3,542 | 3,584 |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% |  |
5.75% Senior Notes due 2023 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 384 | 384 |
Long-term Debt, Gross | $ 384 | 384 |
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |  |
2.75% Contingent Convertible Senior Notes Due 2035 [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Common Stock Price Conversion Thresholds | $ / shares | $ 45.02 |  |
Debt Instrument, Date of First Required Payment | May 14, 2016 |  |
2.75% Contingent Convertible Senior Notes Due 2035 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 2 | 2 |
Long-term Debt, Gross | $ 2 | 2 |
Debt Instrument, Interest Rate, Stated Percentage | 2.75% |  |
2.5% Contingent Convertible Senior Notes due 2037 [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Common Stock Price Conversion Thresholds | $ / shares | $ 59.44 |  |
Debt Instrument, Date of First Required Payment | Nov. 14, 2017 |  |
2.5% Contingent Convertible Senior Notes due 2037 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 902 | 1,110 |
Long-term Debt, Gross | $ 846 | 1,027 |
Debt Instrument, Interest Rate, Stated Percentage | 2.50% |  |
2.5% Contingent Convertible Senior Notes due 2037 [Member] | Convertible Debt [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.50% |  |
2.25% Contingent Convertible Senior Notes Due 2038 [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Common Stock Price Conversion Thresholds | $ / shares | $ 100.20 |  |
Debt Instrument, Date of First Required Payment | Jun. 14, 2019 |  |
2.25% Contingent Convertible Senior Notes Due 2038 [Member] | Senior Notes [Member] |  |  |
Long-Term Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 340 | 340 |
Long-term Debt, Gross | $ 293 | $ 290 |
Debt Instrument, Interest Rate, Stated Percentage | 2.25% |  |

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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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