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Capital Structure - Total debt outstanding (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
May 16, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Due after one year through five years $ 1,000   $ 1,317
Due after five years through ten years 550   550
Due after ten years 5,141   4,641
Total long-term debt principal 6,691   6,508
Debt issuance costs (60)   (57)
Total long-term debt 6,631   6,451
Short-term debt 0   0
Total debt $ 6,631   6,451
Redemption price as percentage of principal amount plus accrued and unpaid interest 100.00%    
7.45% Senior Notes, due 2019      
Debt Instrument [Line Items]      
Due after one year through five years $ 0   317
Note stated interest rate (as a percent) 7.45% 7.45%  
Floating Rate Senior Notes, due 2021      
Debt Instrument [Line Items]      
Due after one year through five years $ 250   250
Floating Rate Senior Notes, due 2023      
Debt Instrument [Line Items]      
Due after one year through five years 250   250
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%    
6.900% 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%    
3.850% Senior Notes, due 2049      
Debt Instrument [Line Items]      
Due after ten years $ 500   0
Note stated interest rate (as a percent) 3.85%    
5.100% Subordinated Debentures, due 2053      
Debt Instrument [Line Items]      
Due after ten years $ 500   500
Note stated interest rate (as a percent) 5.10%    
5.750% Subordinated Debentures, due 2053      
Debt Instrument [Line Items]      
Due after ten years $ 800   800
Note stated interest rate (as a percent) 5.75%    
6.500% 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%   6.50%