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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred $ 56 $ 55
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 1,333 779
Obligation to Return Securities Received as Collateral 1,389 834
Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Obligation to Return Securities Received as Collateral 0 0
Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Obligation to Return Securities Received as Collateral 0 0
Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Obligation to Return Securities Received as Collateral 0 0
Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 56 55
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 1,333 779
Obligation to Return Securities Received as Collateral 1,389 834
Corporate Debt Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 40 42
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 553 279
Corporate Debt Securities [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Corporate Debt Securities [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Corporate Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Corporate Debt Securities [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 40 42
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 553 279
Residential Mortgage Backed Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 52 10
Residential Mortgage Backed Securities [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Residential Mortgage Backed Securities [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Residential Mortgage Backed Securities [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Residential Mortgage Backed Securities [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 52 10
Debt Security, Government, Non-US [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 5 5
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 106 95
Debt Security, Government, Non-US [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Debt Security, Government, Non-US [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Debt Security, Government, Non-US [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Debt Security, Government, Non-US [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 5 5
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 106 95
US States and Political Subdivisions Debt Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 11 3
US States and Political Subdivisions Debt Securities [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
US States and Political Subdivisions Debt Securities [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
US States and Political Subdivisions Debt Securities [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0 0
US States and Political Subdivisions Debt Securities [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 11 3
Asset-backed Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 229 54
Asset-backed Securities [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Asset-backed Securities [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Asset-backed Securities [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Asset-backed Securities [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 229 54
Commercial Mortgage Backed Securities [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 221 63
Commercial Mortgage Backed Securities [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Commercial Mortgage Backed Securities [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Commercial Mortgage Backed Securities [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Commercial Mortgage Backed Securities [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 221 63
US Government Debt Securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 14  
US Government Debt Securities | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0  
US Government Debt Securities | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0  
US Government Debt Securities | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0  
US Government Debt Securities | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 14  
Japanese Government Debt Securities Member    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 158 278
Japanese Government Debt Securities Member | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Japanese Government Debt Securities Member | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Japanese Government Debt Securities Member | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement 0 0
Japanese Government Debt Securities Member | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement $ 158 278
Canadian Provincial Governments [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   5
Canadian Provincial Governments [Member] | Maturity Overnight [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   0
Canadian Provincial Governments [Member] | Maturity Less than 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   0
Canadian Provincial Governments [Member] | Maturity 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   0
Canadian Provincial Governments [Member] | Maturity Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred   $ 5