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Debt (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2015
Jun. 10, 2015
Debt Instrument [Line Items]        
Other Long-term Debt, Noncurrent $ 7,309,000,000 $ 7,309,000,000   $ 2,000,000,000
Unamortized Discount (9,000,000) (10,000,000)    
Fair value adjustments 7,000,000 17,000,000    
Unamortized Debt Issuance Expense (35,000,000) (39,000,000)    
Amounts due within one year (683,000,000) (1,000,000)    
Total long-term debt due after one year 6,589,000,000 7,276,000,000    
Debt Immediately Due If Change In Control 236,000,000      
Long-term Debt, Fiscal Year Maturity [Abstract]        
2015 683,000,000      
2016 854,000,000      
2017 228,000,000      
2018 600,000,000      
2019 0      
Thereafter $ 4,944,000,000      
Senior Unsecured Notes Due 2015 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage     0.90%  
Other Long-term Debt, Noncurrent     $ 1,000,000,000  
Senior Unsecured Notes Due 2017 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.00%      
Other Long-term Debt, Noncurrent $ 682,000,000 682,000,000    
Senior Unsecured Notes Due 2018 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.90%      
Other Long-term Debt, Noncurrent $ 854,000,000 854,000,000    
Senior Unsecured Notes Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 7.50%      
Other Long-term Debt, Noncurrent $ 228,000,000 228,000,000    
Senior Unsecured Notes Due 2020 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 2.70%     2.70%
Other Long-term Debt, Noncurrent $ 600,000,000 600,000,000   $ 600,000,000
Senior Unsecured Notes Due 2022 [A] [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 2.80%      
Other Long-term Debt, Noncurrent $ 1,000,000,000 1,000,000,000    
Senior Unsecured Notes Due 2022 [B] [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 9.375%      
Other Long-term Debt, Noncurrent $ 32,000,000 32,000,000    
Series Medium Term Notes Due 2022 [Member]        
Debt Instrument [Line Items]        
Other Long-term Debt, Noncurrent $ 3,000,000 3,000,000    
Senior Unsecured Notes Due 2023 [A] [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 8.50%      
Other Long-term Debt, Noncurrent $ 70,000,000 70,000,000    
Senior Unsecured Notes Due 2023 [B] [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 8.125%      
Other Long-term Debt, Noncurrent $ 131,000,000 131,000,000    
Senior Unsecured Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 3.85%     3.85%
Other Long-term Debt, Noncurrent $ 900,000,000 900,000,000   $ 900,000,000
Senior Unsecured Notes Due 2032 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.80%      
Other Long-term Debt, Noncurrent $ 550,000,000 550,000,000    
Senior Unsecured Notes Due 2037 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.60%      
Other Long-term Debt, Noncurrent $ 750,000,000 750,000,000    
Senior Unsecured Notes Due 2045 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.20%     5.20%
Other Long-term Debt, Noncurrent $ 500,000,000 500,000,000   $ 500,000,000
Capital Lease Obligation of Consolidated Subsidiary due 2016 - 2049 [Member]        
Debt Instrument [Line Items]        
Other Long-term Debt, Noncurrent $ 9,000,000 9,000,000    
Obligation Relating To Revenue Bonds Due 2037 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.125%      
Other Long-term Debt, Noncurrent $ 1,000,000,000 $ 1,000,000,000