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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Group Benefits Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning liabilities for unpaid losses and loss adjustment expenses, gross $ 27,713            
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments       $ 298 $ 550    
Less payment              
Ending liabilities for unpaid losses and loss adjustment expenses, gross 27,605 $ 27,713          
Group Insurance Policies [Member]              
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]              
Beginning liabilities for unpaid losses and loss adjustment expenses, gross 5,889 6,013 $ 6,258        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments       208 218 $ 209 $ 210
Beginning liabilities for unpaid losses and loss adjustment expenses, net 5,564 5,671 5,804 $ 5,564 $ 5,671 $ 5,804 $ 6,048
Add provision for unpaid losses and loss adjustment expenses              
Current Year Claims and Claims Adjustment Expense 2,562 2,447 2,446        
Liability for Unpaid Claims and Claims Adjustment Expense Prior Years Interest 202 214 225        
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) (162) (146) (223)        
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 2,602 2,515 2,448        
Less payment              
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year 1,327 1,257 1,211        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 1,382 1,391 1,482        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 2,709 2,648 2,693        
Ending liabilities for unpaid losses and loss adjustment expenses, net 5,564 5,671 5,804        
Ending liabilities for unpaid losses and loss adjustment expenses, gross 5,772 5,889 6,013        
Operating Expense [Member]              
Add provision for unpaid losses and loss adjustment expenses              
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims $ 0 $ 0 $ 0