Deferred Policy Acquisition Costs - Progression of deferred policy acquisition costs (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred policy acquisition costs and present value of future profits, beginning balance		$ 1,037	$ 1,682
Deferred policy acquisition costs and present value of future profits, additions		208	252
Deferred policy acquisition costs and present value of future profits, periodic amortization		(273)	(195)
Deferred policy acquisition costs and present value of future profits, change included in realized gains		10	2
Deferred policy acquisition costs and present value of future profits, foreign currency translation		0	1
Deferred policy acquisition costs and present value of future profits, change in unrealized		591	(295)
Deferred policy acquisition costs and present value of future profits, ending balance		1,573	1,447
P&C
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs, beginning balance		322	299
Deferred policy acquisition costs, additions		158	187
Deferred policy acquisition costs, periodic amortization		(170)	(175)
Deferred policy acquisition costs, foreign currency translation		0	1
Deferred policy acquisition costs, ending balance		310	312
Annuity and Other
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Deferred policy acquisition costs, beginning balance		1,303	1,285
Deferred policy acquisition costs, additions		49	64
Deferred policy acquisition costs, periodic amortization		(98)	(15)
Deferred policy acquisition costs, change included in realized gains		10	2
Deferred policy acquisition costs, ending balance		1,264	1,336
Movement in Deferred Sales Inducements [Roll Forward]
Deferred sales inducements, beginning balance		75	86
Deferred sales inducements, additions		1	1
Deferred sales inducements, periodic amortization		(3)	(3)
Deferred sales inducements, change included in realized gains		0	0
Deferred sales inducements, ending balance		73	84
Movement in Present Value of Future Insurance Profits [Roll Forward]
Present value of future profits, beginning balance		36	42
Present value of future profits, periodic amortization		(2)	(2)
Present value of future profits, ending balance		34	40
Movement in Unrealized Gains (Losses) Related to Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Unrealized investment gains (losses), beginning balance	[1]	(699)	(30)
Unrealized investment gains (losses), change in unrealized	[1]	591	(295)
Unrealized investment gains (losses), ending balance	[1]	(108)	(325)
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred policy acquisition costs and present value of future profits, beginning balance		715	1,383
Deferred policy acquisition costs and present value of future profits, additions		50	65
Deferred policy acquisition costs and present value of future profits, periodic amortization		(103)	(20)
Deferred policy acquisition costs and present value of future profits, change included in realized gains		10	2
Deferred policy acquisition costs and present value of future profits, change in unrealized		591	(295)
Deferred policy acquisition costs and present value of future profits, ending balance		1,263	1,135
Excluding Unrealized Gains | Annuity and Other
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Deferred policy acquisition costs and present value of future profits, beginning balance		1,414	1,413
Deferred policy acquisition costs and present value of future profits, change in unrealized		0	0
Deferred policy acquisition costs and present value of future profits, ending balance		$ 1,371	$ 1,460

[1] Adjustments to DPAC related to net unrealized gains/losses on securities and cash flow hedges.