Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet Assets But Available for Offset in Event of Default (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Offsetting [Abstract]
Cash collateral netted against derivative assets	$ 2,200	$ 3,000
Derivative assets not subject to netting arrangements	$ 37	$ 20

Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet Assets But Available for Offset in Event of Default (Parenthetical) (Detail) - USD ($)
$ in Millions

Mar. 31, 2023

Dec. 31, 2022

Cash collateral netted against derivative assets

$ 2,200

$ 3,000

Derivative assets not subject to netting arrangements

$ 37

$ 20