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Capital Structure Capital Structure, Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt outstanding:    
Long-term debt $ 5,124 $ 5,140
Long-term debt total principal 5,175 5,194
Debt issuance costs (51) (54)
Short-term debt 0 0
Total debt $ 5,124 5,140
Redemption price as percentage of principal amount plus accrued and unpaid interest 100.00%  
6.75% Senior Debentures, due 2018    
Debt outstanding:    
Long-term debt $ 176 $ 176
Note stated interest rate (as a percent) 6.75% 6.75%
7.45% Senior Notes, due 2019    
Debt outstanding:    
Long-term debt $ 317 $ 317
Note stated interest rate (as a percent) 7.45% 7.45%
3.15% Senior Notes, due 2023    
Debt outstanding:    
Long-term debt $ 500 $ 500
Note stated interest rate (as a percent) 3.15% 3.15%
6.125% Senior Notes, due 2032    
Debt outstanding:    
Long-term debt $ 159 $ 159
Note stated interest rate (as a percent) 6.125% 6.125%
5.35% Senior Notes due 2033    
Debt outstanding:    
Long-term debt $ 323 $ 323
Note stated interest rate (as a percent) 5.35% 5.35%
5.55% Senior Notes due 2035    
Debt outstanding:    
Long-term debt $ 546 $ 546
Note stated interest rate (as a percent) 5.55% 5.55%
5.95% Senior Notes, due 2036    
Debt outstanding:    
Long-term debt $ 386 $ 386
Note stated interest rate (as a percent) 5.95% 5.95%
6.90% Senior Debentures, due 2038    
Debt outstanding:    
Long-term debt $ 165 $ 165
Note stated interest rate (as a percent) 6.90% 6.90%
5.20% Senior Notes due 2042    
Debt outstanding:    
Long-term debt $ 62 $ 62
Note stated interest rate (as a percent) 5.20% 5.20%
4.50% Senior Notes, due 2043    
Debt outstanding:    
Long-term debt $ 500 $ 500
Note stated interest rate (as a percent) 4.50% 4.50%
5.10% Subordinated Debentures, due 2053    
Debt outstanding:    
Long-term debt $ 500 $ 500
Note stated interest rate (as a percent) 5.10% 5.10%
5.75% Subordinated Debentures, due 2053    
Debt outstanding:    
Long-term debt $ 800 $ 800
Note stated interest rate (as a percent) 5.75% 5.75%
6.125% Junior Subordinated Debentures, due 2067    
Debt outstanding:    
Long-term debt $ 241 $ 252
Note stated interest rate (as a percent) 6.125% 6.125%
6.50% Junior Subordinated Debentures, due 2067    
Debt outstanding:    
Long-term debt $ 500 $ 500
Note stated interest rate (as a percent) 6.50% 6.50%
Federal Home Loan Bank (“FHLB”) advances, due 2018    
Debt outstanding:    
Long-term debt $ 0 $ 8