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Capital Structure, Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 08, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Long-term debt $ 6,347   $ 5,124
Long-term debt total principal 6,408   5,175
Debt issuance costs (61)   (51)
Short-term debt 0   0
Total debt $ 6,347   5,124
Redemption price as percentage of principal amount plus accrued and unpaid interest 100.00%    
6.75% Senior Debentures, due 2018      
Debt Instrument [Line Items]      
Long-term debt $ 176   176
Note stated interest rate (as a percent) 6.75%    
7.45% Senior Notes, due 2019      
Debt Instrument [Line Items]      
Long-term debt $ 317   317
Note stated interest rate (as a percent) 7.45%    
3.15% Senior Notes, due 2023      
Debt Instrument [Line Items]      
Long-term debt $ 500   500
Note stated interest rate (as a percent) 3.15%    
3.28% Senior Notes, due 2026      
Debt Instrument [Line Items]      
Long-term debt $ 550   0
Note stated interest rate (as a percent) 3.28% 3.28%  
6.125% Senior Notes, due 2032      
Debt Instrument [Line Items]      
Long-term debt $ 159   159
Note stated interest rate (as a percent) 6.125%    
5.35% Senior Notes due 2033      
Debt Instrument [Line Items]      
Long-term debt $ 323   323
Note stated interest rate (as a percent) 5.35%    
5.55% Senior Notes due 2035      
Debt Instrument [Line Items]      
Long-term debt $ 546   546
Note stated interest rate (as a percent) 5.55%    
5.95% Senior Notes, due 2036      
Debt Instrument [Line Items]      
Long-term debt $ 386   386
Note stated interest rate (as a percent) 5.95%    
6.90% Senior Debentures, due 2038      
Debt Instrument [Line Items]      
Long-term debt $ 165   165
Note stated interest rate (as a percent) 6.90%    
5.20% Senior Notes due 2042      
Debt Instrument [Line Items]      
Long-term debt $ 62   62
Note stated interest rate (as a percent) 5.20%    
4.50% Senior Notes, due 2043      
Debt Instrument [Line Items]      
Long-term debt $ 500   500
Note stated interest rate (as a percent) 4.50%    
4.20% Senior Notes, due 2046      
Debt Instrument [Line Items]      
Long-term debt $ 700   0
Note stated interest rate (as a percent) 4.20% 4.20%  
5.10% Subordinated Debentures, due 2053      
Debt Instrument [Line Items]      
Long-term debt $ 500   500
Note stated interest rate (as a percent) 5.10%    
5.75% Subordinated Debentures, due 2053      
Debt Instrument [Line Items]      
Long-term debt $ 800   800
Note stated interest rate (as a percent) 5.75%    
6.125% Junior Subordinated Debentures, due 2067      
Debt Instrument [Line Items]      
Long-term debt $ 224   241
Note stated interest rate (as a percent) 6.125%    
6.50% Junior Subordinated Debentures, due 2067      
Debt Instrument [Line Items]      
Long-term debt $ 500   $ 500
Note stated interest rate (as a percent) 6.50%