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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,030 | $ 1,941
Gross Unrealized Gains | 10 | 7
Gross Unrealized Losses | 30 | 2
Estimated Fair Value | 2,010 | 1,946
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,277 | 1,174
Gross Unrealized Gains | 4 | 5
Gross Unrealized Losses | 21 | 1
Estimated Fair Value | 1,260 | 1,178
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 453 | 420
Gross Unrealized Gains | 6 | 1
Gross Unrealized Losses | 8 | 1
Estimated Fair Value | 451 | 420
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 144 | 126
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 1 | 0
Estimated Fair Value | 143 | 127
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 138 | 78
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 138 | 78
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 7 | 1
GSEs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6 | 49
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 6 | 49
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5 | 86
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 5 | 86
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 7
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | $ 7

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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