XML 65 R51.htm IDEA: XBRL DOCUMENT v3.5.0.2
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