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Available-for-sale investments (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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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 | $ 40,779 | $ 37,911
Gross unrealized gains | 245 | 128
Gross unrealized losses | (75) | (258)
Fair value | 40,949 | 37,781
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 | 8,029 | 6,681
Gross unrealized gains | 6 | 1
Gross unrealized losses | (17) | (68)
Fair value | 8,018 | 6,614
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 | 225 | 302
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | (3)
Fair value | 224 | 299
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 | 2,634 | 1,784
Gross unrealized gains | 41 | 9
Gross unrealized losses | (4) | (34)
Fair value | 2,671 | 1,759
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 | 10,198 | 8,476
Gross unrealized gains | 63 | 21
Gross unrealized losses | (7) | (37)
Fair value | 10,254 | 8,460
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 | 9,829 | 8,793
Gross unrealized gains | 94 | 59
Gross unrealized losses | (17) | (63)
Fair value | 9,906 | 8,789
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 | 1,251 | 1,079
Gross unrealized gains | 12 | 5
Gross unrealized losses | (2) | (7)
Fair value | 1,261 | 1,077
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 | 2,212 | 1,968
Gross unrealized gains | 2 | 1
Gross unrealized losses | (10) | (29)
Fair value | 2,204 | 1,940
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 | 2,071 | 1,731
Gross unrealized gains | 0 | 1
Gross unrealized losses | (4) | (13)
Fair value | 2,067 | 1,719
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 | 2,455 | 2,782
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 2,455 | 2,782
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 | 1,746 | 4,188
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 1,746 | 4,188
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 | 40,650 | 37,784
Gross unrealized gains | 218 | 97
Gross unrealized losses | (62) | (254)
Fair value | 40,806 | 37,627
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 | 129 | 127
Gross unrealized gains | 27 | 31
Gross unrealized losses | (13) | (4)
Fair value | $ 143 | $ 154

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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