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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | $ 149 | $ 530
Securities Lending | [1] | 117 | 222
Total gross secured borrowings |  | 266 | 752
Corporate Bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | 149 | 530
Securities Lending |  | 117 | 222
Overnight and Continuous [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Lending |  | 117 | 222
Total gross secured borrowings |  | 117 | 222
Overnight and Continuous [Member] | Corporate Bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Lending |  | 117 | 222
Up to 30 days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  |  | 100
Total gross secured borrowings |  |  | 100
Up to 30 days [Member] | Corporate Bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  |  | 100
30 to 90 Days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  |  | 280
Total gross secured borrowings |  |  | 280
30 to 90 Days [Member] | Corporate Bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  |  | 280
Greater than 90 days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | 149 | 150
Total gross secured borrowings |  | 149 | 150
Greater than 90 days [Member] | Corporate Bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | $ 149 | $ 150
[1] | Our pledged securities under securities lending agreements are included in fixed maturity AFS securities on our Consolidated Balance Sheets. We generally obtain collateral in an amount equal to 102% and 105% of the fair value of the domestic and foreign securities, respectively. We value collateral daily and obtain additional collateral when deemed appropriate. The cash received in our securities lending program is typically invested in cash and invested cash or fixed maturity AFS securities.

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- Definition The amount of cash received as security in return for loaning securities to another party. + References No definition available. + Details
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- Definition The amount of cash received as security in return for loaning securities to another party under reverse repurchase agreements, excluding the payable margin repurchase + References No definition available. + Details
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- Definition The amount of cash received as security in return for loaning securities to another party under securities lending agreements. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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