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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 2,059 | $ 1,761
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 4 | 4
Estimated Fair Value | 2,056 | 1,758
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,354 | 1,180
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 2 | 2
Estimated Fair Value | 1,353 | 1,179
GSEs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 210 | 232
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1 | 1
Estimated Fair Value | 209 | 231
U.S. treasury notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 193 | 84
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 193 | 84
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 153 | 143
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1 | 1
Estimated Fair Value | 152 | 142
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 110 | 69
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 110 | 69
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 39 | 53
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 39 | $ 53

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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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