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Investments (Schedule of Fair Value of Securities in a Continuous Unrealized Loss Position for Less Than 12 Months and More Than 12 Months) (Details) (Residential Mortgage-Backed Securities - Agency [Member], USD $)
In Millions, unless otherwise specified |
Dec. 31, 2014
securities
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Residential Mortgage-Backed Securities - Agency [Member]
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| Investment Holdings [Line Items] | |
| Available-for-sale investment securities, number of securities in a loss position (in securities) | 8 |
| Available-for-sale investment securities, continuous unrealized loss position, less than 12 months, fair value | $ 97 |
| Available-for-sale investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 |
| Available-for-sale investment securities, continuous unrealized loss position, more than 12 months, fair value | 225 |
| Available-for-sale investment securities, continuous unrealized loss position, more than 12 months, unrealized losses | $ (1) |