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Investments - Available-for-Sale Investments (Details) $ in Millions | Jun. 30, 2017 USD ($) Security | Dec. 31, 2016 USD ($) Security
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Schedule of Available-for-sale Securities [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 1,160 | $ 841
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 3 | $ 4
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 519 | 580
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 0 | 0
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 913 | $ 542
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 2 | $ 2
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 418 | 378
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 0 | 0
GSEs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value | $ 247 | $ 198
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses | $ 1 | $ 1
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security | 101 | 73
In a Continuous Loss Position for 12 Months or More, Estimated Fair value | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses | $ 0 | $ 0
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security | 0 | 0
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value |  | $ 101
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses |  | $ 1
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security |  | 129
In a Continuous Loss Position for 12 Months or More, Estimated Fair value |  | $ 0
In a Continuous Loss Position for 12 Months or More, Unrealized Losses |  | $ 0
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security |  | 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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