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Business Dispositions and Discontinued Operations - Major Classes of Assets and Liabilities Transferred by the Company to the Buyer in Connection with Sale (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 03, 2017
May 10, 2017
Dec. 31, 2016
Assets        
Assets $ 164,936     $ 169,020
Liabilities        
Liabilities 162,442     163,534
P&C Runoff Subsidiaries        
Assets        
Assets       870
Liabilities        
Liabilities       611
Disposal Group, Disposed of by Sale, Not Discontinued Operations | P&C Runoff Subsidiaries        
Assets        
Cash and investments     $ 669 657
Reinsurance recoverables     268 213
Assets     937  
Liabilities        
Reserve for future policy benefits and unpaid loss and loss adjustment expenses     653 600
Other liabilities     $ 12 11
Liabilities 665      
Intercompany reinsurance recoverables       0
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business        
Assets        
Cash and investments 30,135     31,433
Reinsurance recoverables 20,785     20,364
Loss accrual (3,257)     0
Other assets 1,439     688
Separate account assets 115,834     115,665
Assets 164,936     168,150
Liabilities        
Reserve for future policy benefits and unpaid loss and loss adjustment expenses 14,482     13,609
Other policyholder funds and benefits payable 29,228     30,574
Long-term debt 142 $ 142   142
Other liabilities 2,756     2,933
Separate account liabilities 115,834     115,665
Liabilities $ 162,442     $ 162,923