Segment Information (Product Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	$ 51,222	$ 45,843	$ 44,370
Life insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	20,550	20,330	20,436
Accident & health insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	14,489	14,002	14,128
Annuities
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	10,990	6,999	5,552
Property and casualty insurance
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	3,651	3,613	3,560
Other
Segment Reporting Information [Line Items]
Premiums, Fees & Other Revenues	$ 1,542	$ 899	$ 694