Fair Value of Financial Instruments (Fair Value Inputs Quantitative Information) (Details) - Significant Unobservable Inputs (Level 3) [Member] - Discounted Cash Flow Valuation Technique [Member] $ in Millions	Sep. 30, 2020 USD ($) item
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure | $	$ 3,009
Corporate Bonds [Member] | Maximum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.158
Corporate Bonds [Member] | Minimum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.001
Corporate Bonds [Member] | Weighted Average [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.021
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure | $	$ 27
Foreign Government Bonds [Member] | Maximum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.093
Foreign Government Bonds [Member] | Minimum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.093
Foreign Government Bonds [Member] | Weighted Average [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.093
ABS [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure | $	$ 21
ABS [Member] | Maximum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.043
ABS [Member] | Minimum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.043
ABS [Member] | Weighted Average [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Fixed maturity AFS and trading securities, measurement input	0.043
Equity Securities [Member] | Fixed Maturity AFS Securities [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure | $	$ 22
Equity Securities [Member] | Maximum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Equity securities, measurement input	0.063
Equity Securities [Member] | Minimum [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Equity securities, measurement input	0.045
Equity Securities [Member] | Weighted Average [Member] | Fixed Maturity AFS Securities [Member] | Liquidity/Duration Adjustment [Member]
Liabilities Fair Value Disclosure [Abstract]
Equity securities, measurement input	0.059
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure | $	$ 1,105
GLB Ceded Embedded Derivatives [Member] | Maximum [Member] | Other Assets [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.30
GLB Ceded Embedded Derivatives [Member] | Minimum [Member] | Other Assets [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.01
GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.94
GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | NPR [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.0113
GLB Ceded Embedded Derivatives [Member] | Weighted Average [Member] | Other Assets [Member] | Volatility [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.1428
GLB Direct And Ceded Embedded Derivative [Member] | Maximum [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	1
GLB Direct And Ceded Embedded Derivative [Member] | Maximum [Member] | Other Assets [Member] | Claims Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	1
GLB Direct And Ceded Embedded Derivative [Member] | Maximum [Member] | Other Assets [Member] | Premiums Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	1.15
GLB Direct And Ceded Embedded Derivative [Member] | Maximum [Member] | Other Assets [Member] | NPR [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.0162
GLB Direct And Ceded Embedded Derivative [Member] | Maximum [Member] | Other Assets [Member] | Volatility [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.28
GLB Direct And Ceded Embedded Derivative [Member] | Minimum [Member] | Other Assets [Member] | Utilization Of Guaranteed Withdrawls [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.85
GLB Direct And Ceded Embedded Derivative [Member] | Minimum [Member] | Other Assets [Member] | Claims Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.60
GLB Direct And Ceded Embedded Derivative [Member] | Minimum [Member] | Other Assets [Member] | Premiums Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.80
GLB Direct And Ceded Embedded Derivative [Member] | Minimum [Member] | Other Assets [Member] | NPR [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.0013
GLB Direct And Ceded Embedded Derivative [Member] | Minimum [Member] | Other Assets [Member] | Volatility [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.01
Indexed Annuity And IUL Contracts [Member] | Other Assets [Member]
Assets Fair Value Disclosure [Abstract]
Assets Fair Value Disclosure | $	$ 536
Indexed Annuity And IUL Contracts [Member] | Maximum [Member] | Other Assets [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0.09
Indexed Annuity And IUL Contracts [Member] | Minimum [Member] | Other Assets [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative assets, measurement input	0
Future contract benefits - indexed annuity and IUL contracts embedded derivatives | Future Contract Benefits [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value | $	$ (2,688)
Future contract benefits - indexed annuity and IUL contracts embedded derivatives | Maximum [Member] | Future Contract Benefits [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.09
Future contract benefits - indexed annuity and IUL contracts embedded derivatives | Minimum [Member] | Future Contract Benefits [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0
GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member]
Liabilities Fair Value Disclosure [Abstract]
Liabilities measured at fair value | $	$ (1,106)
GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.30
GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	1
GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Claims Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	1
GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Premiums Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	1.15
GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | NPR [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.0162
GLB Direct Embedded Derivatives [Member] | Maximum [Member] | Other Liabilities [Member] | Volatility [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.28
GLB Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Lapse Rate [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.01
GLB Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.85
GLB Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Claims Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.60
GLB Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Premiums Utilization Factor [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.80
GLB Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | NPR [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.0013
GLB Direct Embedded Derivatives [Member] | Minimum [Member] | Other Liabilities [Member] | Volatility [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.01
GLB Direct Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | Utilization Of Guaranteed Withdrawls [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.94
GLB Direct Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | NPR [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.0113
GLB Direct Embedded Derivatives [Member] | Weighted Average [Member] | Other Liabilities [Member] | Volatility [Member]
Liabilities Fair Value Disclosure [Abstract]
Derivative liability, measurement input	0.1428