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Derivative Financial Instruments and Off-balance sheet Financial Instruments (Details 7) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivative Financial Instruments and Off-balance sheet Financial Instruments    
Commitments to invest in limited partnership interests $ 1,269 $ 1,223
Commitments to extend mortgage loans 0 44
Private placement commitments 21 25
Other loan commitments $ 46 $ 46