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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
May 20, 2016
Debt Instrument [Line Items]      
Total long-term debt $ 14,333 $ 12,384  
Real Estate Loans and securities pledged 1,100 126  
Senior Medium-Term Notes Due Through 2021 [Member]      
Debt Instrument [Line Items]      
Senior medium-term notes $ 2,766 $ 2,799  
Long-term debt weighted average interest rate 3.56% 3.57%  
2.075% Subordinated notes due 2028 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 2.075%    
Subordinated long-term notes $ 161 $ 162  
6.875% Subordinated Notes Due 2029 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 6.875%    
Subordinated long-term notes $ 109 111  
7.750% Subordinated Notes Due 2029 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 7.75%    
Subordinated long-term notes $ 141 141  
7.25% Subordinated notes due 2021 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 7.25%   3.40%
Subordinated long-term notes $ 348 $ 358 $ 600
Long-term debt weighted average interest rate 7.25% 7.25%  
6.75% Senior Notes Due 2020 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 6.75%    
Subordinated long-term notes $ 327 $ 338  
Long-term debt weighted average interest rate 6.75% 6.75%  
Other Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Subordinated long-term notes $ 69 $ 78  
Long-term debt weighted average interest rate 3.02% 4.61%  
Senior Medium-Term Notes Due Through 2039 [Member]      
Debt Instrument [Line Items]      
Senior medium-term notes $ 8,011 $ 6,715  
Long-term debt weighted average interest rate 2.24% 1.93%  
3.18% Senior Remarketable Notes Due 2027 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 3.18%    
Subordinated long-term notes $ 202 $ 193  
5.70% Subordinated notes due 2017 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 5.70%    
Subordinated long-term notes $ 0 207  
4.625% Subordinated notes due 2018 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 4.625%    
Subordinated long-term notes $ 100 102  
3.40% Subordinated notes due 2026 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 3.40%    
Subordinated long-term notes $ 565 567  
6.95% Subordinated notes due 2028 [Member]      
Debt Instrument [Line Items]      
Debt instrument interest rate 6.95%    
Subordinated long-term notes $ 299 299  
Secured Borrowing Due Through 2052 [Member]      
Debt Instrument [Line Items]      
Secured borrowing due through 2021 $ 24 $ 68  
Long-term debt weighted average interest rate 4.46% 4.45%  
Federal Home Loan Bank [Member]      
Debt Instrument [Line Items]      
Federal Home Loan Bank advances due through 2036 $ 1,106 $ 126  
Long-term debt weighted average interest rate 2.32% 3.64%  
Investment Fund Financing [Member]      
Debt Instrument [Line Items]      
Investment Fund Financing due through 2052 $ 88 $ 100  
Long-term debt weighted average interest rate 1.94% 1.94%  
Capital Lease Obligations [Member]      
Debt Instrument [Line Items]      
Obligations under Capital Leases due 2032 $ 17 $ 20  
Key [Member]      
Debt Instrument [Line Items]      
Total long-term debt 3,921 3,987  
Subsidiaries [Member]      
Debt Instrument [Line Items]      
Total long-term debt $ 10,412 $ 8,397