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Investments - Available-for-Sale Investments (Details) $ in Millions	Dec. 31, 2015 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 1,135
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 6
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security	846
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 119
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security	87
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 825
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 4
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security	588
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 119
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security	87
GSEs
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 182
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	77
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
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 128
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	181
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

X

- 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=27724398&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=27724398&loc=d3e27337-111563

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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 less than twelve months.

+ 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=27724398&loc=d3e27290-111563

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+ References

Reference 1: 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=27724398&loc=d3e27337-111563

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+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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