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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | $ 533 | $ 535
Securities Lending | [1] | 200 | 216
Total gross secured borrowings |  | 733 | 751
Corporate bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | 533 | 535
Securities Lending |  | 200 | 212
Foreign government bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Lending |  |  | 4
Overnight and Continuous [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Lending |  | 200 | 216
Total gross secured borrowings |  | 200 | 216
Overnight and Continuous [Member] | Corporate bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Lending |  | 200 | 212
Overnight and Continuous [Member] | Foreign government bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Securities Lending |  |  | 4
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 |  | 283 | 389
Total gross secured borrowings |  | 283 | 389
30 to 90 Days [Member] | Corporate bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | 283 | 389
Greater than 90 days [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | 150 | 146
Total gross secured borrowings |  | 150 | 146
Greater than 90 days [Member] | Corporate bonds [Member] |  |  |
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] |  |  |
Repurchase Agreements |  | $ 150 | $ 146
[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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