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Debt - Senior Notes and Contingent Convertible Senior Notes Purchased Narrative (Details) (USD $)
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6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | |||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2014
Senior Notes [Member]
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Jun. 30, 2013
Senior Notes [Member]
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Apr. 24, 2014
Senior Notes [Member]
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Jun. 30, 2013
Senior Notes [Member]
Premium on Extinguishment of Debt [Member]
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Jun. 30, 2013
Senior Notes [Member]
Unamortized Deferred Charges on Extinguishment of Debt [Member]
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Jun. 30, 2014
Minimum [Member]
Senior Notes [Member]
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Jun. 30, 2014
Maximum [Member]
Senior Notes [Member]
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Jun. 30, 2014
2.5% Contingent Convertible Senior Notes due 2037 [Member]
Senior Notes [Member]
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Dec. 31, 2013
2.5% Contingent Convertible Senior Notes due 2037 [Member]
Senior Notes [Member]
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Jun. 30, 2014
2.75% Contingent Convertible Senior Notes Due 2035 [Member]
Senior Notes [Member]
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Dec. 31, 2013
2.75% Contingent Convertible Senior Notes Due 2035 [Member]
Senior Notes [Member]
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Jun. 30, 2014
2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Senior Notes [Member]
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Dec. 31, 2013
2.25% Contingent Convertible Senior Notes Due 2038 [Member]
Senior Notes [Member]
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Jun. 30, 2014
4.875% Senior Notes due 2022 [Member]
Senior Notes [Member]
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Dec. 31, 2013
4.875% Senior Notes due 2022 [Member]
Senior Notes [Member]
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Jun. 30, 2014
3.25% Senior Notes due 2016 [Member]
Senior Notes [Member]
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Dec. 31, 2013
3.25% Senior Notes due 2016 [Member]
Senior Notes [Member]
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Jun. 30, 2013
3.25% Senior Notes due 2016 [Member]
Senior Notes [Member]
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Jun. 30, 2014
5.375% Senior Notes due 2021 [Member]
Senior Notes [Member]
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Dec. 31, 2013
5.375% Senior Notes due 2021 [Member]
Senior Notes [Member]
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Jun. 30, 2013
5.375% Senior Notes due 2021 [Member]
Senior Notes [Member]
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Jun. 30, 2014
5.75% Senior Notes due 2023 [Member]
Senior Notes [Member]
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Dec. 31, 2013
5.75% Senior Notes due 2023 [Member]
Senior Notes [Member]
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Jun. 30, 2013
5.75% Senior Notes due 2023 [Member]
Senior Notes [Member]
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Jun. 30, 2013
7.625% Senior Notes Due 2013 [Member]
Senior Notes [Member]
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Jun. 30, 2014
6.875% Senior Notes Due 2018 [Member]
Senior Notes [Member]
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Dec. 31, 2013
6.875% Senior Notes Due 2018 [Member]
Senior Notes [Member]
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Jun. 30, 2013
6.875% Senior Notes Due 2018 [Member]
Senior Notes [Member]
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Jun. 30, 2014
6.875% Senior Notes Due 2018 [Member]
Senior Notes [Member]
Premium on Extinguishment of Debt [Member]
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Jun. 30, 2014
6.875% Senior Notes Due 2018 [Member]
Senior Notes [Member]
Unamortized Deferred Charges on Extinguishment of Debt [Member]
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Jun. 30, 2014
9.5% Senior Notes Due 2015 [Member]
Senior Notes [Member]
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Dec. 31, 2013
9.5% Senior Notes Due 2015 [Member]
Senior Notes [Member]
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Jun. 30, 2013
9.5% Senior Notes Due 2015 [Member]
Senior Notes [Member]
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Jun. 30, 2014
9.5% Senior Notes Due 2015 [Member]
Senior Notes [Member]
Premium on Extinguishment of Debt [Member]
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Jun. 30, 2014
9.5% Senior Notes Due 2015 [Member]
Senior Notes [Member]
Unamortized Discount on Extinguishment of Debt [Member]
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Jun. 30, 2014
9.5% Senior Notes Due 2015 [Member]
Senior Notes [Member]
Unamortized Deferred Charges on Extinguishment of Debt [Member]
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Jun. 30, 2013
6.775% Senior Notes Due 2019 [Member]
Senior Notes [Member]
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Jun. 30, 2013
6.775% Senior Notes Due 2019 [Member]
Senior Notes [Member]
Unamortized Discount on Extinguishment of Debt [Member]
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Jun. 30, 2013
6.775% Senior Notes Due 2019 [Member]
Senior Notes [Member]
Unamortized Deferred Charges on Extinguishment of Debt [Member]
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| 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 | |||||||||||||||||||||||||||