Segment Information (Total Revenues of Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 3,606	$ 3,467	$ 6,810	$ 6,887
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,965	1,886	3,637	3,681
CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	333	342	653	678
EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	507	484	992	977
Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	711	693	1,446	1,421
Corporate and Other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	90	62	82	130
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	1,642	1,584	3,175	3,125
Life Insurance Product Line [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	311	318	607	630
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	371	370	778	754
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	636	634	1,303	1,307
Nontraditional Long-Duration Contracts [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	323	302	462	556
Nontraditional Long-Duration Contracts [Member] | CANADA
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	22	24	46	48
Nontraditional Long-Duration Contracts [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	136	114	214	223
Nontraditional Long-Duration Contracts [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 75	$ 59	$ 143	$ 114