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Investments (Schedule of Securities Pledged by Contractual Maturity) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Repurchase Agreements |  | $ 536 | $ 535
Securities Lending | [1] | 127 | 216
Total gross secured borrowings |  | 663 | 751
Corporate bonds [Member] |  |  |
Repurchase Agreements |  | 536 | 535
Securities Lending |  | 127 | 212
Foreign government bonds [Member] |  |  |
Securities Lending |  |  | 4
Overnight and Continuous [Member] |  |  |
Securities Lending |  | 127 | 216
Total gross secured borrowings |  | 127 | 216
Overnight and Continuous [Member] | Corporate bonds [Member] |  |  |
Securities Lending |  | 127 | 212
Overnight and Continuous [Member] | Foreign government bonds [Member] |  |  |
Securities Lending |  |  | 4
30 to 90 Days [Member] |  |  |
Repurchase Agreements |  | 386 | 389
Total gross secured borrowings |  | 386 | 389
30 to 90 Days [Member] | Corporate bonds [Member] |  |  |
Repurchase Agreements |  | 386 | 389
Greater than 90 days [Member] |  |  |
Repurchase Agreements |  | 150 | 146
Total gross secured borrowings |  | 150 | 146
Greater than 90 days [Member] | Corporate bonds [Member] |  |  |
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 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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- Details
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