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Investments - (Summary of Allowance for Credit Losses on HTM Investments) (Detail) - Variable Interest Entity Primary Beneficiary [Member] - Accounting Standards Update 2016-13 [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | $ 46 | $ 37 | [1]
Current period provision for expected credit losses | (23) | (14) |
Initial allowance recognized for PCD assets | 0 | 0 |
Write- Offs | 0 | 0 |
Recoveries | 0 | 0 |
Ending balance | 23 | 23 |
Corporate Obligations [Member] |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 46 | 37 | [1]
Current period provision for expected credit losses | (23) | (14) |
Initial allowance recognized for PCD assets | 0 | 0 |
Write- Offs | 0 | 0 |
Recoveries | 0 | 0 |
Ending balance | $ 23 | $ 23 |
[1] | Represents transition adjustment upon adoption of ASU 2016-13.

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