Segment Information (Product Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	$ 49,486	$ 49,680	$ 51,222
Life insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	21,256	20,759	20,550
Accident & health insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	15,346	15,159	14,489
Annuities
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	7,916	8,590	10,990
Property and casualty insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	3,589	3,716	3,651
Other
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	$ 1,379	$ 1,456	$ 1,542