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Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (55) $ (40) $ (57) $ (74) $ (55) $ (57) $ (49) $ (26)
Investment Income [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0   0   0 0    
Interest Expense [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2)   (1)   (6) (3)    
Other Comprehensive Income (Loss) [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 17   (16)   12 34    
Interest Rate Swap [Member] | Investment Income [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0   0   0 0    
Interest Rate Swap [Member] | Interest Expense [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (2)   (1)   (6) (3)    
Interest Rate Swap [Member] | Other Comprehensive Income (Loss) [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (12)   8   (6) (29)    
Currency Swap [Member] | Investment Income [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0   0   0 0    
Currency Swap [Member] | Interest Expense [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0   0   0 0    
Currency Swap [Member] | Other Comprehensive Income (Loss) [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (5)   $ 8   $ (6) $ (5)