Segment Information (Product Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	$ 49,680	$ 51,222	$ 45,843
Life insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	20,759	20,550	20,330
Accident & health insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	15,159	14,489	14,002
Annuities
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	8,590	10,990	6,999
Property and casualty insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	3,716	3,651	3,613
Other
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	$ 1,456	$ 1,542	$ 899