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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 2,518 | $ 1,761
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | 3 | 4
Estimated Fair Value | 2,517 | 1,758
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 227 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 228 |
U.S. treasury notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 97 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 97 |
Subtotal - current restricted investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 324 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 325 |
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,387 | 1,180
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | 2 | 2
Estimated Fair Value | 1,386 | 1,179
U.S. treasury notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 263 | 84
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 263 | 84
GSEs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 242 | 232
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1 | 1
Estimated Fair Value | 241 | 231
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 140 | 143
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 140 | 142
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 128 | 69
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 128 | 69
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34 | 53
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 34 | $ 53
Subtotal - current investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,194 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 3 |
Estimated Fair Value | $ 2,192 |

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