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Segment Information (Total Assets of Reportable Segments) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 91,449 $ 84,656
Corporate and Other [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 7,212 9,906
Other Segments | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 49,712 45,504
Other Segments | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 5,010 4,695
Other Segments | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 11,833 12,055
Other Segments | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 17,682 12,496
Life Insurance Product Line [Member] | Other Segments | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 20,196 20,071
Life Insurance Product Line [Member] | Other Segments | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,999 4,682
Life Insurance Product Line [Member] | Other Segments | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 4,808 4,763
Life Insurance Product Line [Member] | Other Segments | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 10,259 8,197
Nontraditional Long-Duration Contracts [Member] | Other Segments | Americas [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 29,516 25,433
Nontraditional Long-Duration Contracts [Member] | Other Segments | CANADA    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 11 13
Nontraditional Long-Duration Contracts [Member] | Other Segments | EMEA [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 7,025 7,292
Nontraditional Long-Duration Contracts [Member] | Other Segments | Asia Pacific [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 7,423 $ 4,299