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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Premiums Earned
Direct	$ 14,439	$ 14,204	$ 14,031
Assumed	2,265	678	368
Ceded	(660)	(650)	(627)
Net earned premiums, fees and other considerations	17,182	15,309	14,738
Group Benefits
Premiums Earned
Gross earned premiums, fees and other considerations	3,615	3,281	3,160
Assumed	2,044	446	107
Ceded	(61)	(50)	(44)
Net earned premiums, fees and other considerations	5,598	3,677	3,223
Property and Casualty Insurance Products
Premiums Written
Direct	10,784	10,865	10,906
Assumed	217	223	253
Ceded	(593)	(571)	(591)
Net	10,408	10,517	10,568
Premiums Earned
Direct	10,824	10,923	10,871
Assumed	221	232	261
Ceded	(599)	(600)	(583)
Net	$ 10,446	$ 10,555	$ 10,549

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