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Investments (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | $ 32,167 | $ 41,453
Gross unrealized gains | 11 | 87
Gross unrealized losses | (508) | (222)
Fair value | 31,670 | 41,318
U.S. Treasury securities [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 5,207 | 8,313
Gross unrealized gains | 0 | 1
Gross unrealized losses | (104) | (72)
Fair value | 5,103 | 8,242
Other government-related debt securities - U.S. [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 132 | 225
Gross unrealized gains | 0 | 0
Gross unrealized losses | (3) | (2)
Fair value | 129 | 223
Other government-related debt securities - Foreign and other [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 1,714 | 2,415
Gross unrealized gains | 3 | 18
Gross unrealized losses | (43) | (11)
Fair value | 1,674 | 2,422
Corporate debt securities - Financial [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 6,189 | 10,089
Gross unrealized gains | 1 | 17
Gross unrealized losses | (137) | (34)
Fair value | 6,053 | 10,072
Corporate debt securities - Industrial [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 5,687 | 9,688
Gross unrealized gains | 6 | 34
Gross unrealized losses | (128) | (52)
Fair value | 5,565 | 9,670
Corporate debt securities - Other [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 916 | 1,393
Gross unrealized gains | 1 | 3
Gross unrealized losses | (21) | (6)
Fair value | 896 | 1,390
Residential mortgage-backed securities [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 1,745 | 2,198
Gross unrealized gains | 0 | 0
Gross unrealized losses | (46) | (30)
Fair value | 1,699 | 2,168
Other mortgage- and asset-backed securities [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 1,293 | 2,312
Gross unrealized gains | 0 | 0
Gross unrealized losses | (26) | (15)
Fair value | 1,267 | 2,297
Money market mutual funds [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 9,234 | 3,245
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 9,234 | 3,245
Other short-term interest-bearing securities [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost | 50 | 1,440
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 50 | 1,440
Total interest-bearing securities [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost |  | 41,318
Gross unrealized gains |  | 73
Gross unrealized losses |  | (222)
Fair value | $ 31,670 | 41,169
Equity securities [Member] |  |
Amortized cost, gross unrealized gains, gross unrealized losses and estimated fair values of available-for-sale investments by type of security |  |
Amortized cost |  | 135
Gross unrealized gains |  | 14
Gross unrealized losses |  | 0
Fair value |  | $ 149

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