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Segment Information (Total Assets of Reportable Segments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 62,972,642 $ 60,514,818
Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 38,400,622 34,562,629
CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,356,425 4,287,824
EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 8,158,746 8,374,488
Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 6,494,776 6,114,027
Corporate and Other [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,562,073 7,175,850
Life Insurance Product Line [Member] | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 19,148,790 18,603,423
Life Insurance Product Line [Member] | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,210,051 4,161,452
Life Insurance Product Line [Member] | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,573,449 3,099,495
Life Insurance Product Line [Member] | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,312,822 4,915,442
Nontraditional Long-Duration Contracts [Member] | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 19,251,832 15,959,206
Nontraditional Long-Duration Contracts [Member] | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 146,374 126,372
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,585,297 5,274,993
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 1,181,954 $ 1,198,585