Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entities [Line Items]
Variable Interest Entity Nonconsolidated Carrying Amount Insurance Assets	$ 2,247	$ 2,258
Variable Interest Entity Nonconsolidated Carrying Amount Insurance Liabilities	1,083	1,434
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	31,506	$ 35,566
Investments:
Variable Interest Entity Nonconsolidated Carrying Amount Derivative Net Assets Or Liabilities	$ 7