Segment Information (Reconciliation of Revenue from Segments to Consolidated) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 4,359	$ 4,043	$ 4,137	$ 4,119	$ 4,143	$ 3,643	$ 3,606	$ 3,204	$ 16,658	$ 14,596	$ 14,300
Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									8,690	7,780	7,779
Canada Segment Reporting Information [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,549	1,352	1,385
EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									2,443	2,104	1,970
Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									3,195	3,115	2,909
Corporate And Other Segment Reporting Information [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									781	245	257
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									7,198	6,560	6,500
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,448	1,260	1,286
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,827	1,633	1,520
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									2,778	2,806	2,681
Insurance, Other [Member] | Americas [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									1,492	1,220	1,279
Insurance, Other [Member] | Canada Segment Reporting Information [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									101	92	99
Insurance, Other [Member] | EMEA [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									616	471	450
Insurance, Other [Member] | Asia Pacific [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues									$ 417	$ 309	$ 228