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Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion $ (192)    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion   $ (20) $ (27)
Gain (Loss) on Investments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0 0
Investment Income [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (8) 0 0
Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (1) (7) (4)
Interest Rate Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion (187)    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion   (28) (33)
Interest Rate Swap [Member] | Gain (Loss) on Investments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0 0
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
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 (1) (7) (4)
Currency Swap [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion (5)    
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion   (8) (6)
Currency Swap [Member] | Gain (Loss) on Investments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0 0
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 (8) 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