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Investments - Schedule (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt securities |  |
Amortized cost | $ 8,206,000,000 | $ 29,064,000,000
Gross unrealized gains | 28,000,000 | 1,000,000
Gross unrealized losses | 0 | (341,000,000)
Fair values | 8,234,000,000 | 28,724,000,000
U.S. Treasury notes [Member] |  |
Debt securities |  |
Amortized cost | 359,000,000 | 2,710,000,000
Gross unrealized gains | 1,000,000 | 0
Gross unrealized losses | 0 | (47,000,000)
Fair values | 360,000,000 | 2,663,000,000
U.S. Treasury bills [Member] |  |
Debt securities |  |
Amortized cost | 0 | 8,191,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 0 | 8,191,000,000
Other government-related debt securities - U.S. [Member] |  |
Debt securities |  |
Amortized cost | 0 | 112,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (2,000,000)
Fair values | 0 | 110,000,000
Other government-related debt securities - Foreign and other [Member] |  |
Debt securities |  |
Amortized cost | 0 | 972,000,000
Gross unrealized gains | 0 | 1,000,000
Gross unrealized losses | 0 | (41,000,000)
Fair values | 0 | 932,000,000
Corporate debt securities - Financial [Member] |  |
Debt securities |  |
Amortized cost | 1,108,000,000 | 2,778,000,000
Gross unrealized gains | 13,000,000 | 0
Gross unrealized losses | 0 | (81,000,000)
Fair values | 1,121,000,000 | 2,697,000,000
Corporate debt securities - Industrial [Member] |  |
Debt securities |  |
Amortized cost | 824,000,000 | 2,603,000,000
Gross unrealized gains | 10,000,000 | 0
Gross unrealized losses | 0 | (99,000,000)
Fair values | 834,000,000 | 2,504,000,000
Corporate debt securities - Other [Member] |  |
Debt securities |  |
Amortized cost | 195,000,000 | 583,000,000
Gross unrealized gains | 3,000,000 | 0
Gross unrealized losses | 0 | (21,000,000)
Fair values | 198,000,000 | 562,000,000
Residential mortgage-backed securities [Member] |  |
Debt securities |  |
Amortized cost | 181,000,000 | 1,458,000,000
Gross unrealized gains | 1,000,000 | 0
Gross unrealized losses | 0 | (36,000,000)
Fair values | 182,000,000 | 1,422,000,000
Other mortgage- and asset-backed securities [Member] |  |
Debt securities |  |
Amortized cost | 0 | 483,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (14,000,000)
Fair values | 0 | 469,000,000
Money market mutual funds [Member] |  |
Debt securities |  |
Amortized cost | 5,250,000,000 | 5,659,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 5,250,000,000 | 5,659,000,000
Other short-term interest-bearing securities [Member] |  |
Debt securities |  |
Amortized cost | 289,000,000 | 3,515,000,000
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 289,000,000 | $ 3,515,000,000

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