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Fair value measurements Fair Value Measurements (Annuitization Experience for GMIB Policies) (Details)
12 Months Ended
Dec. 31, 2016
One Year Of Credible Experience [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience 67.00%
Several Years Of Credible Experience [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience 4.00%
Several Years Of Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 78.00%
No Credible Experience [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Percent of GMIB guaranteed value that are represented by clients with several years of annuitization experience 29.00%
No Credible Experience [Member] | First Year [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 44.00%
No Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 31.00%
Maximum  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 78.00% [1]
Maximum | One Year Of Credible Experience [Member] | First Year [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 41.00%
Maximum | One Year Of Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 78.00%
Maximum | Several Years Of Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 0.00%
Maximum | No Credible Experience [Member] | First Year [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 0.00%
Maximum | No Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 0.00%
Minimum  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 0.00% [1]
Minimum | One Year Of Credible Experience [Member] | First Year [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 2.00%
Minimum | One Year Of Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 1.00%
Minimum | Several Years Of Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 12.00%
Minimum | No Credible Experience [Member] | First Year [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 19.00%
Minimum | No Credible Experience [Member] | Subsequent years [Member]  
Annuitization Experience For GMIB Policies [Line Items]  
Annuitization rate 12.00%
[1] Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.