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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Debt Instrument [Line Items]      
Total medium- and long-term debt $ 2,841 $ 2,675  
Parent Company      
Debt Instrument [Line Items]      
Total medium- and long-term debt 903 1,208  
Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes 1,427 1,445  
Total medium- and long-term debt 1,938 1,467  
4.80% subordinated notes due 2015 | Parent Company      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 0 $ 304  
Stated interest rate 4.80% 4.80%  
Maturity Date May 01, 2015 May 01, 2015  
3.80% subordinated notes due 2026 | Parent Company      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 253 $ 257  
Stated interest rate 3.80% 3.80%  
Maturity Date Jul. 22, 2026 Jul. 22, 2026  
3.00% notes due 2015 | Parent Company      
Debt Instrument [Line Items]      
Medium-term notes $ 300 $ 300  
Stated interest rate 3.00% 3.00%  
Maturity Date Sep. 16, 2015 Sep. 16, 2015  
2.125% notes due 2019 | Parent Company      
Debt Instrument [Line Items]      
Medium-term notes [1] $ 350 $ 347  
Stated interest rate 2.125% 2.125%  
Maturity Date May 23, 2019 May 23, 2019  
5.75% subordinated notes due 2016 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 665 $ 670  
Stated interest rate 5.75% 5.75%  
Maturity Date Nov. 21, 2016 Nov. 21, 2016  
5.20% subordinated notes due 2017 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 541 $ 548  
Stated interest rate 5.20% 5.20%  
Maturity Date Aug. 22, 2017 Aug. 22, 2017  
7.875% subordinated notes due 2026 | Subsidiaries      
Debt Instrument [Line Items]      
Subordinated notes [1] $ 221 $ 227  
Stated interest rate 7.875% 7.875%  
Maturity Date Sep. 15, 2026 Sep. 15, 2026  
2.50% notes due 2020 | Subsidiaries      
Debt Instrument [Line Items]      
Medium-term notes [1] $ 495   $ 0
Stated interest rate [1] 2.50%    
Maturity Date Jun. 02, 2020    
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries      
Debt Instrument [Line Items]      
Other Notes $ 16 $ 22  
Fixed Interest Rate - minimum 6.00% 6.00%  
Fixed Interest Rate - maximum 6.40% 6.40%  
Maturity Date Jun. 30, 2020 Jun. 30, 2020  
[1] The carrying value of medium- and long-term debt has been adjusted to reflect the gain or loss attributable to the risk hedged with interest rate swaps.