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Available-for-sale investments (Unrealized Losses and Fair Values) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | $ 25,250 | $ 18,281
Less than 12 months, Unrealized losses | (191) | (250)
12 months or greater, Fair value | 2,061 | 493
12 months or greater, Unrealized losses | (31) | (8)
U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 7,728 | 5,774
Less than 12 months, Unrealized losses | (70) | (68)
12 months or greater, Fair value | 195 | 0
12 months or greater, Unrealized losses | (2) | 0
Other government-related debt securities - U.S. [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 188 | 201
Less than 12 months, Unrealized losses | (1) | (3)
12 months or greater, Fair value | 34 | 0
12 months or greater, Unrealized losses | (1) | 0
Other government-related debt securities - Foreign and other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 1,163 | 1,192
Less than 12 months, Unrealized losses | (9) | (34)
12 months or greater, Fair value | 115 | 17
12 months or greater, Unrealized losses | (2) | 0
Corporate debt securities - Financial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 5,928 | 3,975
Less than 12 months, Unrealized losses | (28) | (37)
12 months or greater, Fair value | 462 | 44
12 months or greater, Unrealized losses | (6) | 0
Corporate debt securities - Industrial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 5,760 | 3,913
Less than 12 months, Unrealized losses | (43) | (61)
12 months or greater, Fair value | 612 | 149
12 months or greater, Unrealized losses | (9) | (2)
Corporate debt securities - Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 868 | 486
Less than 12 months, Unrealized losses | (4) | (7)
12 months or greater, Fair value | 117 | 7
12 months or greater, Unrealized losses | (2) | 0
Residential mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 1,838 | 1,631
Less than 12 months, Unrealized losses | (24) | (26)
12 months or greater, Fair value | 276 | 158
12 months or greater, Unrealized losses | (6) | (3)
Other mortgage- and asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value | 1,777 | 1,087
Less than 12 months, Unrealized losses | (12) | (10)
12 months or greater, Fair value | 250 | 118
12 months or greater, Unrealized losses | $ (3) | (3)
Equity securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, Fair value |  | 22
Less than 12 months, Unrealized losses |  | (4)
12 months or greater, Fair value |  | 0
12 months or greater, Unrealized losses |  | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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