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Investments (Securities Pledged as Collateral Related to Repurchase Reverse Repurchase Program) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | $ 105 | $ 104
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 711 | 384
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 771 | 478
Secured Borrowings, Gross, Difference, Amount | 45 | 10
Obligation to Return Securities Received as Collateral | 816 | 488
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 | 105 | 104
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 711 | 384
Obligation to Return Securities Received as Collateral | 816 | 488
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 | 105 | 104
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 417 | 286
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 | 105 | 104
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 417 | 286
Debt Security, Government, Non-US [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 294 | 98
Debt Security, Government, Non-US [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
Debt Security, Government, Non-US [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
Debt Security, Government, Non-US [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
Debt Security, Government, Non-US [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 | $ 294 | $ 98

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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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