v2.4.0.8

Debt - Senior Notes and Contingent Convertible Senior Notes Purchased Narrative (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended |  |  | 6 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2014 Senior Notes [Member] | Jun. 30, 2013 Senior Notes [Member] | Apr. 24, 2014 Senior Notes [Member] | Jun. 30, 2013 Senior Notes [Member] Premium on Extinguishment of Debt [Member] | Jun. 30, 2013 Senior Notes [Member] Unamortized Deferred Charges on Extinguishment of Debt [Member] | Jun. 30, 2014 Minimum [Member] Senior Notes [Member] | Jun. 30, 2014 Maximum [Member] Senior Notes [Member] | Jun. 30, 2014 2.5% Contingent Convertible Senior Notes due 2037 [Member] Senior Notes [Member] | Dec. 31, 2013 2.5% Contingent Convertible Senior Notes due 2037 [Member] Senior Notes [Member] | Jun. 30, 2014 2.75% Contingent Convertible Senior Notes Due 2035 [Member] Senior Notes [Member] | Dec. 31, 2013 2.75% Contingent Convertible Senior Notes Due 2035 [Member] Senior Notes [Member] | Jun. 30, 2014 2.25% Contingent Convertible Senior Notes Due 2038 [Member] Senior Notes [Member] | Dec. 31, 2013 2.25% Contingent Convertible Senior Notes Due 2038 [Member] Senior Notes [Member] | Jun. 30, 2014 4.875% Senior Notes due 2022 [Member] Senior Notes [Member] | Dec. 31, 2013 4.875% Senior Notes due 2022 [Member] Senior Notes [Member] | Jun. 30, 2014 3.25% Senior Notes due 2016 [Member] Senior Notes [Member] | Dec. 31, 2013 3.25% Senior Notes due 2016 [Member] Senior Notes [Member] | Jun. 30, 2013 3.25% Senior Notes due 2016 [Member] Senior Notes [Member] | Jun. 30, 2014 5.375% Senior Notes due 2021 [Member] Senior Notes [Member] | Dec. 31, 2013 5.375% Senior Notes due 2021 [Member] Senior Notes [Member] | Jun. 30, 2013 5.375% Senior Notes due 2021 [Member] Senior Notes [Member] | Jun. 30, 2014 5.75% Senior Notes due 2023 [Member] Senior Notes [Member] | Dec. 31, 2013 5.75% Senior Notes due 2023 [Member] Senior Notes [Member] | Jun. 30, 2013 5.75% Senior Notes due 2023 [Member] Senior Notes [Member] | Jun. 30, 2013 7.625% Senior Notes Due 2013 [Member] Senior Notes [Member] | Jun. 30, 2014 6.875% Senior Notes Due 2018 [Member] Senior Notes [Member] | Dec. 31, 2013 6.875% Senior Notes Due 2018 [Member] Senior Notes [Member] | Jun. 30, 2013 6.875% Senior Notes Due 2018 [Member] Senior Notes [Member] | Jun. 30, 2014 6.875% Senior Notes Due 2018 [Member] Senior Notes [Member] Premium on Extinguishment of Debt [Member] | Jun. 30, 2014 6.875% Senior Notes Due 2018 [Member] Senior Notes [Member] Unamortized Deferred Charges on Extinguishment of Debt [Member] | Jun. 30, 2014 9.5% Senior Notes Due 2015 [Member] Senior Notes [Member] | Dec. 31, 2013 9.5% Senior Notes Due 2015 [Member] Senior Notes [Member] | Jun. 30, 2013 9.5% Senior Notes Due 2015 [Member] Senior Notes [Member] | Jun. 30, 2014 9.5% Senior Notes Due 2015 [Member] Senior Notes [Member] Premium on Extinguishment of Debt [Member] | Jun. 30, 2014 9.5% Senior Notes Due 2015 [Member] Senior Notes [Member] Unamortized Discount on Extinguishment of Debt [Member] | Jun. 30, 2014 9.5% Senior Notes Due 2015 [Member] Senior Notes [Member] Unamortized Deferred Charges on Extinguishment of Debt [Member] | Jun. 30, 2013 6.775% Senior Notes Due 2019 [Member] Senior Notes [Member] | Jun. 30, 2013 6.775% Senior Notes Due 2019 [Member] Senior Notes [Member] Unamortized Discount on Extinguishment of Debt [Member] | Jun. 30, 2013 6.775% Senior Notes Due 2019 [Member] Senior Notes [Member] Unamortized Deferred Charges on Extinguishment of Debt [Member]
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  | 2.50% |  | 2.75% |  | 2.25% |  | 4.875% |  | 3.25% |  | 3.25% | 5.375% |  | 5.375% | 5.75% |  | 5.75% | 7.625% | 6.875% |  | 6.875% |  |  | 9.50% |  |  |  |  |  | 6.775% |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  | 8.00% |  | 6.86% |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 2,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,500,000,000 | 3,000,000,000 |  | 3,000,000,000 |  |  | 50,000,000 | 75,000,000 | 1,168,000,000 | 1,168,000,000 | 396,000,000 | 396,000,000 | 347,000,000 | 347,000,000 | 1,500,000,000 | 0 | 500,000,000 | 500,000,000 | 500,000,000 | 700,000,000 | 700,000,000 | 700,000,000 | 1,100,000,000 | 1,100,000,000 | 1,100,000,000 | 247,000,000 | 0 | 97,000,000 |  |  |  | 0 | 1,265,000,000 |  |  |  |  |  |  |
Proceeds from issuance of senior notes, net of discount and offering costs | 3,460,000,000 | 2,966,000,000 | 2,274,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  | 405,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 217,000,000 | 97,000,000 |  | 377,000,000 |  |  | 1,265,000,000 |  | 1,454,000,000 |  |  |  | 1,300,000,000 |  |
Gain (Loss) on Repurchase of Debt Instrument |  |  | $ 37,000,000 |  | $ 32,000,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000 |  |  | $ 5,000,000 | $ 1,000,000 | $ 99,000,000 |  |  | $ 87,000,000 | $ 9,000,000 | $ 3,000,000 | $ 33,000,000 | $ 14,000,000 | $ 19,000,000

X
- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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 No definition available. + Details
Name: | us-gaap_GainLossOnRepurchaseOfDebtInstrument
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration