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Investments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt securities |  |
Amortized cost | $ 29,810 |
Gross unrealized gains | 5 |
Gross unrealized losses | (397) |
Fair values | 29,418 | $ 41,169
Equity securities |  |
Amortized cost |  | 135
Gross unrealized gains |  | 14
Gross unrealized losses |  | 0
Fair values |  | 149
Amortized cost |  | 41,453
Gross unrealized gains |  | 87
Gross unrealized losses |  | (222)
Fair values |  | 41,318
U.S. Treasury notes [Member] |  |
Debt securities |  |
Amortized cost | 2,710 | 8,313
Gross unrealized gains | 0 | 1
Gross unrealized losses | (84) | (72)
Fair values | 2,626 | 8,242
U.S. Treasury bills [Member] |  |
Debt securities |  |
Amortized cost | 5,376 |
Gross unrealized gains | 0 |
Gross unrealized losses | 0 |
Fair values | 5,376 |
Other government-related debt securities - U.S. [Member] |  |
Debt securities |  |
Amortized cost | 112 | 225
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3) | (2)
Fair values | 109 | 223
Other government-related debt securities - Foreign and other [Member] |  |
Debt securities |  |
Amortized cost | 1,048 | 2,415
Gross unrealized gains | 1 | 18
Gross unrealized losses | (41) | (11)
Fair values | 1,008 | 2,422
Corporate debt securities - Financial [Member] |  |
Debt securities |  |
Amortized cost | 2,786 | 10,089
Gross unrealized gains | 0 | 17
Gross unrealized losses | (89) | (34)
Fair values | 2,697 | 10,072
Corporate debt securities - Industrial [Member] |  |
Debt securities |  |
Amortized cost | 2,654 | 9,688
Gross unrealized gains | 4 | 34
Gross unrealized losses | (80) | (52)
Fair values | 2,578 | 9,670
Corporate debt securities - Other [Member] |  |
Debt securities |  |
Amortized cost | 594 | 1,393
Gross unrealized gains | 0 | 3
Gross unrealized losses | (21) | (6)
Fair values | 573 | 1,390
Residential mortgage-backed securities [Member] |  |
Debt securities |  |
Amortized cost | 1,524 | 2,198
Gross unrealized gains | 0 | 0
Gross unrealized losses | (62) | (30)
Fair values | 1,462 | 2,168
Other mortgage- and asset-backed securities [Member] |  |
Debt securities |  |
Amortized cost | 490 | 2,312
Gross unrealized gains | 0 | 0
Gross unrealized losses | (17) | (15)
Fair values | 473 | 2,297
Money market mutual funds [Member] |  |
Debt securities |  |
Amortized cost | 8,955 | 3,245
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 8,955 | 3,245
Other short-term interest-bearing securities [Member] |  |
Debt securities |  |
Amortized cost | 3,561 | 1,440
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 3,561 | 1,440
Total interest-bearing securities [Member] |  |
Debt securities |  |
Amortized cost |  | 41,318
Gross unrealized gains |  | 73
Gross unrealized losses |  | (222)
Fair values |  | $ 41,169

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