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Available-for-sale investments (Schedule) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 41,453 | $ 37,911
Gross unrealized gains | 87 | 128
Gross unrealized losses | (222) | (258)
Fair value | 41,318 | 37,781
U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 8,313 | 6,681
Gross unrealized gains | 1 | 1
Gross unrealized losses | (72) | (68)
Fair value | 8,242 | 6,614
Other government-related debt securities - U.S. [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 225 | 302
Gross unrealized gains | 0 | 0
Gross unrealized losses | (2) | (3)
Fair value | 223 | 299
Other government-related debt securities - Foreign and other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,415 | 1,784
Gross unrealized gains | 18 | 9
Gross unrealized losses | (11) | (34)
Fair value | 2,422 | 1,759
Corporate debt securities - Financial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 10,089 | 8,476
Gross unrealized gains | 17 | 21
Gross unrealized losses | (34) | (37)
Fair value | 10,072 | 8,460
Corporate debt securities - Industrial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 9,688 | 8,793
Gross unrealized gains | 34 | 59
Gross unrealized losses | (52) | (63)
Fair value | 9,670 | 8,789
Corporate debt securities - Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 1,393 | 1,079
Gross unrealized gains | 3 | 5
Gross unrealized losses | (6) | (7)
Fair value | 1,390 | 1,077
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,198 | 1,968
Gross unrealized gains | 0 | 1
Gross unrealized losses | (30) | (29)
Fair value | 2,168 | 1,940
Other mortgage- and asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 2,312 | 1,731
Gross unrealized gains | 0 | 1
Gross unrealized losses | (15) | (13)
Fair value | 2,297 | 1,719
Money market mutual funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,245 | 2,782
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 3,245 | 2,782
Other short-term interest-bearing securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 1,440 | 4,188
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair value | 1,440 | 4,188
Total interest-bearing securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 41,318 | 37,784
Gross unrealized gains | 73 | 97
Gross unrealized losses | (222) | (254)
Fair value | 41,169 | 37,627
Equity securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 135 | 127
Gross unrealized gains | 14 | 31
Gross unrealized losses | 0 | (4)
Fair value | $ 149 | $ 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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