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Related Party Transactions (Related Party Transactions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]      
Document Fiscal Year Focus 2016    
Other expenses $ 1,738 $ 1,722 $ 1,764
Universal life and investment-type product policy fees 2,696 2,940 3,193
Other revenues 761 504 539
Assets 199,273 202,362  
Liabilities 189,556 190,799  
Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Other expenses 820 1,000 985
All Services and Transactions Except Broker Dealer Activities [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties (602) (199) (1,042)
Related Party Transaction, Expenses from Transactions with Related Party (265) 511 539
Assets 8,972 12,277  
Liabilities 9,518 9,479  
Broker Dealer Activities [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties 192 208 202
Related Party Transaction, Expenses from Transactions with Related Party 606 612 $ 572
Assets 18 18  
Liabilities $ 20 $ 20