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Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | $ 10,794 | $ 10,832 | $ 12,500 | $ 14,909 | $ 12,500 | $ 25,241
Foreign currency translation adjustments | (39) |  |  | (71) | (56) | (153)
Balance as of end of period | 10,927 | 10,794 | 10,832 | 14,349 | 10,927 | 14,349
Foreign currency translation [Member] |  |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | (687) | (683) | (670) |  | (670) |
Foreign currency translation adjustments | (39) | (4) | (13) |  |  |
Income taxes | 0 | 0 | 0 |  |  |
Balance as of end of period | (726) | (687) | (683) |  | (726) |
Cash flow hedges [Member] |  |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | 182 | 286 | 241 |  | 241 |
Unrealized gains | 71 | (96) | 30 |  |  |
Reclassification adjustments to income | 38 | (36) | 28 |  |  |
Income taxes | (23) | 28 | (13) |  |  |
Balance as of end of period | 268 | 182 | 286 |  | 268 |
Available-for-sale securities [Member] |  |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | 36 | (117) | (338) |  | (338) |
Unrealized gains | 35 | 161 | 218 |  |  |
Reclassification adjustments to income | 3 | 2 | 4 |  |  |
Income taxes | (8) | (10) | (1) |  |  |
Balance as of end of period | 66 | 36 | (117) |  | 66 |
Other [Member] |  |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | 4 | (2) | (2) |  | (2) |
Unrealized gains | 0 | 0 | 0 |  |  |
Other |  | 6 |  |  |  |
Balance as of end of period | 4 | 4 | (2) |  | 4 |
AOCI [Member] |  |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |  |
Balance as of beginning of period | (465) | (516) | (769) | (873) | (769) | (679)
Foreign currency translation adjustments | (39) | (4) | (13) |  |  |
Unrealized gains | 106 | 65 | 248 |  |  |
Reclassification adjustments to income | 41 | (34) | 32 |  |  |
Other |  | 6 |  |  |  |
Income taxes | (31) | 18 | (14) |  |  |
Balance as of end of period | $ (388) | $ (465) | $ (516) | $ (809) | $ (388) | $ (809)

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