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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

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