Derivatives and Hedging Activities - Bifurcated Embedded Derivatives (Detail) - USD ($) $ in Millions |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Derivative [Line Items] | ||
| Embedded Derivative, Fair Value of Embedded Derivative Asset | $ 1,061 | $ 1,450 |
| Embedded Derivative, Fair Value of Embedded Derivative Liability | (1,285) | (1,220) |
| Embedded Derivative, Fair Value of Embedded Derivative, Net Liability | (224) | 230 |
| Notional amount | 43,599,044 | 38,600,406 |
| Embedded Derivatives Classified In Debt [Member] | ||
| Derivative [Line Items] | ||
| Notional amount | $ 11,856 | $ 12,548 |