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Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Increase (Decrease) in AOCI [Roll Forward] |  |  |
Balance as of beginning of period |  |  | $ 29,875
Balance as of end of period | $ 32,229 |  |
Foreign currency translation [Member] |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |
Balance as of beginning of period | (551) | $ (586) | (610)
OCI, before reclassifications, before tax | 38 | 37 | 21
Income taxes | 3 | (2) | 3
Balance as of end of period | (510) | (551) | (586)
Accumulated net gain (loss) from cash flow hedges [Member] |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |
Balance as of beginning of period | 8 | 209 | 282
OCI, before reclassifications, before tax | 65 | 17 | 17
Reclassification adjustments to income | (140) | (330) | (131)
Income taxes | 25 | 112 | 41
Balance as of end of period | (42) | 8 | 209
Available-for-sale securities [Member] |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |
Balance as of beginning of period | 100 | 20 | (138)
OCI, before reclassifications, before tax | 41 | 73 | 116
Reclassification adjustments to income | (26) | 47 | 49
Income taxes | (6) | (40) | (7)
Balance as of end of period | 109 | 100 | 20
Accumulated Other Adjustment Attributable to Parent [Member] |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |
Balance as of beginning of period | (6) | (5) | (5)
OCI, before reclassifications, before tax | 0 | 0 | 0
Other | 6 | (1) |
Balance as of end of period | 0 | (6) | (5)
AOCI [Member] |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |
Balance as of beginning of period | (449) | (362) | (471)
OCI, before reclassifications, before tax | 106 | 90 | 133
Reclassification adjustments to income | (166) | (283) | (82)
Other | 6 | (1) |
Income taxes | 22 | 70 | 37
Balance as of end of period | $ (443) | $ (449) | $ (362)

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