Fair Value, Significant Unobservable Inputs (Details) $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated Fair Value	$ 44,380	$ 44,646
Level 3 | Total fixed maturities
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Estimated Fair Value	$ 1,225	$ 966
Debt Securities, Available-for-sale, Valuation Technique [Extensible List]	Range (Weighted Average)	Range (Weighted Average)
Debt Securities, Available-for-sale, Measurement Input [Extensible List]	Credit spread	Credit spread
Credit spread | Minimum | Level 3 | Total fixed maturities | Range (Weighted Average)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.01	0.01
Credit spread | Maximum | Level 3 | Total fixed maturities | Range (Weighted Average)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.07	0.08
Credit spread | Weighted Average | Level 3 | Total fixed maturities | Range (Weighted Average)
Quantitative Information About the Significant Unobservable Inputs [Abstract]
Measurement input	0.02	0.03