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Short-term and Long-term Investments, Restricted Deposits - By Investment Type (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities |  |
Gross Unrealized Gains | $ 404 | $ 200
Gross Unrealized Losses | (58) | (9)
Equity securities | 561 | 0
Private equity investments | 778 | 664
Life insurance contracts | 146 | 148
Total, Amortized Cost | 12,493 | 9,047
Total, Fair Value | 12,839 | 9,238
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Debt Securities |  |
Amortized Cost | 975 | 211
Gross Unrealized Gains | 6 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 981 | 212
Corporate securities |  |
Debt Securities |  |
Amortized Cost | 4,841 | 3,629
Gross Unrealized Gains | 222 | 108
Gross Unrealized Losses | (32) | (4)
Fair Value | 5,031 | 3,733
Restricted certificates of deposit |  |
Debt Securities |  |
Amortized Cost | 104 | 482
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 104 | 482
Restricted cash equivalents |  |
Debt Securities |  |
Amortized Cost | 157 | 8
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 157 | 8
Short-term time deposits |  |
Debt Securities |  |
Amortized Cost | 56 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 56 | 0
Municipal securities |  |
Debt Securities |  |
Amortized Cost | 2,429 | 2,320
Gross Unrealized Gains | 111 | 69
Gross Unrealized Losses | (5) | (1)
Fair Value | 2,535 | 2,388
Asset-backed securities |  |
Debt Securities |  |
Amortized Cost | 974 | 741
Gross Unrealized Gains | 10 | 5
Gross Unrealized Losses | (13) | (2)
Fair Value | 971 | 744
Residential mortgage-backed securities |  |
Debt Securities |  |
Amortized Cost | 888 | 464
Gross Unrealized Gains | 32 | 8
Gross Unrealized Losses | 0 | (1)
Fair Value | 920 | 471
Commercial mortgage-backed securities |  |
Debt Securities |  |
Amortized Cost | 584 | 380
Gross Unrealized Gains | 23 | 9
Gross Unrealized Losses | (8) | (1)
Fair Value | $ 599 | $ 388

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