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Debt - Short-term and Long-term Debt by Issuance (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 15, 2018
Mar. 15, 2018
Schedule of Debt [Line Items]            
Revolving Credit Facilities   $ 0 $ 0      
Total Notes and Debentures   4,795 5,115      
Unamortized discount and debt issuance cost   117 117      
Total Debt   4,678 4,998      
Less: Current maturities   413 320      
Long-Term Debt   4,265 4,678      
Interest Expense   298 316 $ 327    
6.3% Notes, due 2018            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 0 320      
Interest rate   6.30%        
6.0% Notes, due 2019            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 413 413      
Interest rate   6.00%        
5.5% Notes, due 2020            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 500 500      
Interest rate   5.50%        
5.125% Notes, due 2022            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 800 800      
Interest rate   5.125%        
5.95% Notes, due 2036            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 300 300      
Interest rate   5.95%        
6.625% Notes, due 2040            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 295 295      
Interest rate   6.625%        
6.1% Notes, due 2041            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 409 409      
Unamortized discount and debt issuance cost   $ 78 $ 79      
Interest rate   6.10% 6.10%      
Debt Instrument, Interest Rate, Effective Percentage     7.90%      
6.625% Notes, due 2042            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 178 $ 178      
Interest rate   6.625%        
4.4% Notes, due 2048            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 500 0      
4.3% Notes, due 2043            
Schedule of Debt [Line Items]            
Senior Notes and Debentures   $ 300 $ 300      
Interest rate   4.30% 4.30%      
4.4% Notes, due 2048            
Schedule of Debt [Line Items]            
Interest rate   4.40%       4.40%
7.875% Notes, due 2042            
Schedule of Debt [Line Items]            
Junior Subordinated Debentures   $ 600 $ 600      
Interest rate   7.875% 7.875%      
3 month Libor 2.125% Notes, due 2067 [1]            
Schedule of Debt [Line Items]            
Junior Subordinated Debentures   $ 500 $ 500      
3 month Libor 2.125% Notes, due 2067 [1] | LIBOR            
Schedule of Debt [Line Items]            
Derivative, Fixed Interest Rate 4.39%          
Variable interest rate 2.125% 2.125%        
8.125% Notes, due 2068            
Schedule of Debt [Line Items]            
Junior Subordinated Debentures   $ 0 $ 500      
Interest rate   8.125%     8.125%