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Segment Information (Total Assets of Reportable Segments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 60,954,823 $ 60,514,818
Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 35,189,036 34,562,629
CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,361,000 4,287,824
EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 8,664,626 8,374,488
Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 6,270,056 6,114,027
Corporate and Other [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 6,470,105 7,175,850
Life Insurance Product Line [Member] | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 18,839,888 18,603,423
Life Insurance Product Line [Member] | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,234,253 4,161,452
Life Insurance Product Line [Member] | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,385,127 3,099,495
Life Insurance Product Line [Member] | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,095,054 4,915,442
Nontraditional Long-Duration Contracts [Member] | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 16,349,148 15,959,206
Nontraditional Long-Duration Contracts [Member] | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 126,747 126,372
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,279,499 5,274,993
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 1,175,002 $ 1,198,585