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Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total medium- and long-term debt $ 5,890 $ 3,058
Parent Company    
Debt Instrument [Line Items]    
Total medium- and long-term debt 626 608
Subsidiaries    
Debt Instrument [Line Items]    
Subordinated notes 1,767 1,763
Total medium- and long-term debt 5,264 2,450
3.80% subordinated notes due 2026 | Parent Company    
Debt Instrument [Line Items]    
Subordinated notes [1] $ 274 $ 259
Stated interest rate 3.80% 3.80%
Maturity date Jul. 22, 2026 Jul. 22, 2026
2.125% notes due 2019 | Parent Company    
Debt Instrument [Line Items]    
Medium-term notes [1] $ 352 $ 349
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],[2] $ 651 $ 659
Par value swapped to variable rate 250  
Total par value outstanding $ 650  
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] $ 516 $ 530
Stated interest rate 5.20% 5.20%
Maturity date Aug. 22, 2017 Aug. 22, 2017
4.00% subordinated notes due 2025 | Subsidiaries    
Debt Instrument [Line Items]    
Subordinated notes [1] $ 370 $ 351
Stated interest rate 4.00% 4.00%
Maturity date Jul. 27, 2025 Jul. 27, 2025
7.875% subordinated notes due 2026 | Subsidiaries    
Debt Instrument [Line Items]    
Subordinated notes [1] $ 230 $ 223
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] $ 681 $ 671
Stated interest rate 2.50% 2.50%
Maturity date Jun. 02, 2020 Jun. 02, 2020
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances $ 2,800 $ 0
Weighted-average interest rate 0.4045%  
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries | Minimum    
Debt Instrument [Line Items]    
Maturity date Mar. 04, 2026  
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries | Maximum    
Debt Instrument [Line Items]    
Maturity date May 20, 2026  
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries    
Debt Instrument [Line Items]    
Other notes $ 16 $ 16
Maturity date Jun. 30, 2020 Jun. 30, 2020
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries | Minimum    
Debt Instrument [Line Items]    
Stated interest rate 6.00% 6.00%
6.0% - 6.4% fixed-rate notes due 2020 | Subsidiaries | Maximum    
Debt Instrument [Line Items]    
Stated interest rate 6.40% 6.40%
[1] The fixed interest rates on these notes have been swapped to a variable rate and designated in a hedging relationship. Accordingly, carrying value has been adjusted to reflect the change in the fair value of the debt as a result of changes in the benchmark rate.
[2] The fixed interest rate on $250 million of $650 million total par value of these notes have been swapped to a variable rate. The remaining amount is not swapped.