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Long-Term Debt (Debt Tender Offers and Redemption) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Premiums and fees |  |  |  |  |  | $ 809 | $ 226
Write-off of unamortized debt discounts and debt issuance costs |  |  |  |  |  | 14 | 2
Loss on early extinguishment of debt | $ 0 | $ 823 | $ 0 | $ 0 | $ 0 | 823 | 228
Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Notes Purchased |  |  |  |  |  | 933 | 793
9.95% Notes due 2038 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Notes Purchased |  |  |  |  |  | 441 | 0
Stated interest rate |  |  |  |  | 9.95% |  |
10.20% Note due 2039 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Notes Purchased |  |  |  |  |  | 492 | 0
Stated interest rate |  |  |  |  | 10.20% |  |
9.70% Notes due 2018 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Notes Purchased |  |  |  |  |  | $ 0 | $ 793
Stated interest rate | 9.70% |  |  |  |  | 9.70% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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