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Fair Value Measurements - Significant Unobservable Inputs Securities (Details)
$ in Millions
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale $ 37,444 $ 36,231
Other Short-term Investments 4,060 3,859
Collateralized Loan Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 3,013 2,941
CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 3,329 3,368
Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 16,210 15,233
RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 3,737 3,708
Significant
Unobservable
Inputs
(Level 3)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 2,118 2,051
Other Short-term Investments 187 193
Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 151 115
Significant
Unobservable
Inputs
(Level 3) | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 231 222
Significant
Unobservable
Inputs
(Level 3) | Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 1,643 1,589
Significant
Unobservable
Inputs
(Level 3) | RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale 57 95
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other Short-term Investments $ 154  
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Measurement Input, Credit Spread [Member] | Minimum | Short-term investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Instrument, Measurement Input 2.43  
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Measurement Input, Credit Spread [Member] | Maximum | Short-term investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Instrument, Measurement Input 5.87  
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Measurement Input, Credit Spread [Member] | Weighted Average [Member] | Short-term investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Instrument, Measurement Input 2.51  
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale $ 111 $ 115
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member] | Measurement Input, Credit Spread [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 3.26 3.37
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member] | Measurement Input, Credit Spread [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 3.26 3.37
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Collateralized Loan Obligations [Member] | Measurement Input, Credit Spread [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 3.26 3.37
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale $ 228 $ 219
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | CMBS | Measurement Input, Credit Spread [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 4.49 4.19
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | CMBS | Measurement Input, Credit Spread [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 17.84 13.07
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | CMBS | Measurement Input, Credit Spread [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 5.81 5.27
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale $ 1,596 $ 1,541
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Corporate | Measurement Input, Credit Spread [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.92 0.77
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Corporate | Measurement Input, Credit Spread [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 6.82 6.42
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | Corporate | Measurement Input, Credit Spread [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 3.59 3.60
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale $ 57 $ 65
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Credit Spread [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 1.14 0.62
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Credit Spread [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 2.60 2.49
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Credit Spread [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 1.87 1.60
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Constant Prepayment Rate [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.01 0.01
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Constant Prepayment Rate [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.10 0.10
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Constant Prepayment Rate [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.06 0.07
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Default Rate [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.01 0.01
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Default Rate [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.04 0.04
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Default Rate [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.02 0.02
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Loss Severity [Member] | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.10 0.10
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Loss Severity [Member] | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 1 1
Fair Value, Recurring [Member] | Significant
Unobservable
Inputs
(Level 3) | RMBS | Measurement Input, Loss Severity [Member] | Weighted Average [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0.40 0.38