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Capital Structure - Total debt outstanding (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
May 15, 2018
May 13, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Due after one year through five years $ 1,317     $ 993
Due after five years through ten years 550     550
Due after ten years 4,641     4,865
Total long-term debt principal 6,508     6,408
Debt issuance costs (57)     (58)
Total long-term debt 6,451     6,350
Short-term debt 0     0
Total debt $ 6,451     6,350
Redemption price as percentage of principal amount plus accrued and unpaid interest 100.00%      
6.75% Senior Debentures, due 2018        
Debt Instrument [Line Items]        
Due after one year through five years $ 0     176
Note stated interest rate (as a percent) 6.75% 6.75%    
7.45% Senior Notes, due 2019        
Debt Instrument [Line Items]        
Due after one year through five years $ 317     317
Note stated interest rate (as a percent) 7.45%      
Floating Rate Senior Notes, due 2021        
Debt Instrument [Line Items]        
Due after one year through five years $ 250     0
Floating Rate Senior Notes, due 2023        
Debt Instrument [Line Items]        
Due after one year through five years 250     0
3.15% Senior Notes, due 2023        
Debt Instrument [Line Items]        
Due after one year through five years $ 500     500
Note stated interest rate (as a percent) 3.15%      
3.28% Senior Notes, due 2026        
Debt Instrument [Line Items]        
Due after five years through ten years $ 550     550
Note stated interest rate (as a percent) 3.28%      
6.125% Senior Notes, due 2032        
Debt Instrument [Line Items]        
Due after ten years $ 159     159
Note stated interest rate (as a percent) 6.125%      
5.35% Senior Notes due 2033        
Debt Instrument [Line Items]        
Due after ten years $ 323     323
Note stated interest rate (as a percent) 5.35%      
5.55% Senior Notes due 2035        
Debt Instrument [Line Items]        
Due after ten years $ 546     546
Note stated interest rate (as a percent) 5.55%      
5.95% Senior Notes, due 2036        
Debt Instrument [Line Items]        
Due after ten years $ 386     386
Note stated interest rate (as a percent) 5.95%      
6.90% Senior Debentures, due 2038        
Debt Instrument [Line Items]        
Due after ten years $ 165     165
Note stated interest rate (as a percent) 6.90%      
5.20% Senior Notes due 2042        
Debt Instrument [Line Items]        
Due after ten years $ 62     62
Note stated interest rate (as a percent) 5.20%      
4.50% Senior Notes, due 2043        
Debt Instrument [Line Items]        
Due after ten years $ 500     500
Note stated interest rate (as a percent) 4.50%      
4.20% Senior Notes, due 2046        
Debt Instrument [Line Items]        
Due after ten years $ 700     700
Note stated interest rate (as a percent) 4.20%      
5.10% Subordinated Debentures, due 2053        
Debt Instrument [Line Items]        
Due after ten years $ 500     500
Note stated interest rate (as a percent) 5.10%      
5.75% Subordinated Debentures, due 2053        
Debt Instrument [Line Items]        
Due after ten years $ 800     800
Note stated interest rate (as a percent) 5.75%      
6.125% Junior Subordinated Debentures, due 2067        
Debt Instrument [Line Items]        
Due after ten years $ 0     224
Note stated interest rate (as a percent) 6.125%   6.125%  
6.50% Junior Subordinated Debentures, due 2067        
Debt Instrument [Line Items]        
Due after ten years $ 500     $ 500
Total long-term debt $ 500      
Note stated interest rate (as a percent) 6.50%