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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | $ 102 | $ 105
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 746 | 711
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 830 | 771
Secured Borrowings, Gross, Difference, Amount | 18 | 45
Obligation to Return Securities Received as Collateral | 848 | 816
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 | 102 | 105
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 746 | 711
Obligation to Return Securities Received as Collateral | 848 | 816
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 | 94 | 105
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 366 | 417
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 | 94 | 105
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 366 | 417
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 |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 370 | 294
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 |
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 |
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 |
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 |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 370 | $ 294
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 | 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 |
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 |
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 |
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 | 3 |
Cash and Cash Equivalents [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 10 |
Cash and Cash Equivalents [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 |
Cash and Cash Equivalents [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 |
Cash and Cash Equivalents [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 |
Cash and Cash Equivalents [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 | $ 10 |

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- Definition Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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