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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investments |  |
Amortized Cost | $ 1,761 | $ 1,808
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 4 | 7
Estimated Fair Value | 1,758 | 1,801
Corporate debt securities |  |
Investments |  |
Amortized Cost | 1,180 | 1,189
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 2 | 5
Estimated Fair Value | 1,179 | 1,184
GSEs |  |
Investments |  |
Amortized Cost | 232 | 212
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1 | 1
Estimated Fair Value | 231 | 211
Municipal securities |  |
Investments |  |
Amortized Cost | 143 | 186
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1 | 1
Estimated Fair Value | 142 | 185
U.S. treasury notes |  |
Investments |  |
Amortized Cost | 84 | 78
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 84 | 78
Asset-backed securities |  |
Investments |  |
Amortized Cost | 69 | 63
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 69 | 63
Certificates of deposit |  |
Investments |  |
Amortized Cost | 53 | 80
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 53 | $ 80

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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