Segment Information (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 76,731	$ 64,535
Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	44,470	39,106
Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,425	4,355
EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	10,534	8,381
Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	9,357	6,862
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	7,945	5,831
Life Insurance Product Line [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	19,353	19,236
Life Insurance Product Line [Member] | Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,361	4,201
Life Insurance Product Line [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,032	3,643
Life Insurance Product Line [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,800	5,681
Insurance, Other [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	25,117	19,870
Insurance, Other [Member] | Canada Segment Reporting Information [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	64	154
Insurance, Other [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	6,502	4,738
Insurance, Other [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,557	$ 1,181