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Debt (First Lien Notes) (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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Sep. 30, 2013
First Lien Notes 2017 [Member]
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Dec. 31, 2012
First Lien Notes 2017 [Member]
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Sep. 30, 2013
First Lien Notes 2019 [Member]
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Dec. 31, 2012
First Lien Notes 2019 [Member]
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Sep. 30, 2013
First Lien Notes 2020 [Member]
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Dec. 31, 2012
First Lien Notes 2020 [Member]
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Sep. 30, 2013
First Lien Notes 2021 [Member]
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Dec. 31, 2012
First Lien Notes 2021 [Member]
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Sep. 30, 2013
First Lien Notes 2023 [Member]
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Dec. 31, 2012
First Lien Notes 2023 [Member]
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Sep. 30, 2013
Corporate Debt Securities [Member]
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Dec. 31, 2012
Corporate Debt Securities [Member]
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Dec. 31, 2013
Early Tender Amount [Member]
First Lien Notes 2017 [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||
| Long-term Debt | $ 11,023 | $ 10,750 | $ 1,080 | [1] | $ 1,080 | [1] | $ 360 | [2] | $ 360 | [2] | $ 984 | [2] | $ 983 | [2] | $ 1,800 | [2] | $ 1,800 | [2] | $ 1,080 | [2] | $ 1,080 | [2] | $ 5,304 | $ 5,303 | $ 742 | [1] | ||||
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