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Debt (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term borrowings | $ 0 |  |  | $ 0 |  |  | $ 0
Loss on early extinguishment of debt | 0 | $ 0 | $ 228,000,000 | 0 | $ 228,000,000 |  |
Debt tender premium and fees |  |  | 226,000,000 |  |  |  |
Write-off of unamortized debt discount |  |  | $ 2,000,000 |  |  |  |
Reported Value Measurement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value of long term debt | 12,800,000,000 |  |  | 12,800,000,000 |  |  | 12,800,000,000
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value of long term debt | $ 15,800,000,000 |  |  | $ 15,800,000,000 |  |  | $ 14,500,000,000
Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 9.70% |  |  |  |
Senior Notes [Member] | Notes Issued, 2008 and 2009 [Member] | Subject to Credit Rating Step Up [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 3,400,000,000 |
Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes purchased |  |  | $ 793,000,000 |  |  |  |

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