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DEBT (Details - Junior subordinated debentures) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Debt Instrument [Line Items]        
Interest rate (as a percent)       6.50%
Aggregate principal amount of debt redeemed $ 9,805 $ 16,160 $ 14,197  
Series A-2 and Series A-8 Junior Subordinated Debentures        
Debt Instrument [Line Items]        
Interest rate (as a percent) 5.75%      
Series A-3 Junior Subordinated Debentures        
Debt Instrument [Line Items]        
Interest rate (as a percent) 4.875%      
Series A-6 Junior Subordinated Debentures        
Debt Instrument [Line Items]        
Interest rate (as a percent) 8.175%      
Aggregate principal amount of debt redeemed $ 588      
Subordinated Notes        
Debt Instrument [Line Items]        
Interest rate (as a percent) 2.375%      
Period prior to the date of repayment, redemption or purchase within which a specified amount of net cash proceeds is to be received 360 days