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v3.19.2

Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |
Balance as of beginning of period | $ 10,832 | $ 12,500 | $ 15,620 | $ 12,500 | $ 25,241
Foreign currency translation adjustments | (4) |  | (111) | (17) | (82)
Balance as of end of period | 10,794 | 10,832 | 14,909 | 10,794 | 14,909
Foreign currency translation [Member] |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (683) | (670) |  | (670) |
Foreign currency translation adjustments | (4) | (13) |  |  |
Income taxes | 0 | 0 |  |  |
Balance as of end of period | (687) | (683) |  | (687) |
Cash flow hedges [Member] |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |
Balance as of beginning of period | 286 | 241 |  | 241 |
Unrealized gains | (96) | 30 |  |  |
Reclassification adjustments to income | (36) | 28 |  |  |
Income taxes | 28 | (13) |  |  |
Balance as of end of period | 182 | 286 |  | 182 |
Available-for-sale securities [Member] |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (117) | (338) |  | (338) |
Unrealized gains | 161 | 218 |  |  |
Reclassification adjustments to income | 2 | 4 |  |  |
Income taxes | (10) | (1) |  |  |
Balance as of end of period | 36 | (117) |  | 36 |
Other [Member] |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (2) | (2) |  | (2) |
Unrealized gains | 0 | 0 |  |  |
Other | 6 |  |  |  |
Balance as of end of period | 4 | (2) |  | 4 |
AOCI [Member] |  |  |  |  |
Increase (Decrease) in AOCI [Roll Forward] |  |  |  |  |
Balance as of beginning of period | (516) | (769) | (994) | (769) | (679)
Foreign currency translation adjustments | (4) | (13) |  |  |
Unrealized gains | 65 | 248 |  |  |
Reclassification adjustments to income | (34) | 32 |  |  |
Other | 6 |  |  |  |
Income taxes | 18 | (14) |  |  |
Balance as of end of period | $ (465) | $ (516) | $ (873) | $ (465) | $ (873)

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