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Investments - Available-for-Sale Investments (Details) $ in Millions	Mar. 31, 2018 USD ($) Security	Dec. 31, 2017 USD ($) Security
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 2,001	$ 1,940
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 11	$ 5
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security	915	719
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 226	$ 227
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 4	$ 3
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security	164	164
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 1,276	$ 1,297
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 7	$ 3
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security	610	561
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 93	$ 94
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 2	$ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security	71	69
U.S. treasury notes
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 364	$ 470
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	81	89
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	$ 179	$ 173
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	67	69
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 95	$ 95
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1	$ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security	47	47
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 85	$ 0
In a Continuous Loss Position for Less than 12 Months, Unrealized Losses	$ 1	$ 0
In a Continuous Loss Position for Less than 12 Months, Number of Positions (in security) | Security	97	0
In a Continuous Loss Position for 12 Months or More, Estimated Fair value	$ 38	$ 38
In a Continuous Loss Position for 12 Months or More, Unrealized Losses	$ 1	$ 1
In a Continuous Loss Position for 12 Months or More, Number of Positions (in security) | Security	46	48
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
In a Continuous Loss Position for Less than 12 Months, Estimated Fair Value	$ 97
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	60
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)
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+ References

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