Segment Information (Total Assets of Reportable Segments) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 82,127	$ 76,731
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	45,052	44,470
CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,471	4,425
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	10,999	10,534
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,930	9,357
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	9,675	7,945
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	19,929	19,353
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,458	4,361
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,288	4,032
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	7,815	6,800
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	25,123	25,117
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	13	64
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,711	6,502
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 4,115	$ 2,557