Segment Information (Total Assets of Reportable Segments) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 80,729	$ 76,731
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	44,699	44,470
CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,301	4,425
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	10,536	10,534
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	11,388	9,357
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	9,805	7,945
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	19,867	19,353
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,282	4,361
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,087	4,032
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	7,559	6,800
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	24,832	25,117
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	19	64
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	6,449	6,502
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 3,829	$ 2,557