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v3.19.3.a.u2

Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | $ 12,500 | $ 12,500 | $ 25,241 | $ 29,875 |
Cumulative effect of changes in accounting principles, net of taxes |  |  |  |  | $ 29
Foreign currency translation adjustments |  | (48) | (141) | 81 |
Ending Balance |  | 9,673 | 12,500 | 25,241 |
Foreign currency translation [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | (670) | (670) | (529) | (610) |
Foreign currency translation adjustments | (48) |  | (141) | 77 |
Income taxes | 0 |  | 0 | 4 |
Ending Balance |  | (718) | (670) | (529) |
Cash flow hedges [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | 241 | 241 | (6) | 282 |
Unrealized gains | 127 |  | 61 | 192 |
Reclassification adjustments to income | 211 |  | 262 | (638) |
Income taxes | 18 |  | (76) | 158 |
Ending Balance |  | 175 | 241 | (6) |
Available-for-sale securities [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | (338) | (338) | (144) | (138) |
Cumulative effect of changes in accounting principles, net of taxes |  |  |  |  | (9)
Unrealized gains | 424 |  | (556) | (46) |
Reclassification adjustments to income | 56 |  | 365 | 41 |
Income taxes | (8) |  | 6 | (1) |
Ending Balance |  | 22 | (338) | (144) |
Other [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | (2) | (2) | 0 | (5) |
Other losses |  | (5) | (2) | 5 |
Ending Balance |  | (7) | (2) | 0 |
AOCI [Member] |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | $ (769) | (769) | (679) | (471) |
Cumulative effect of changes in accounting principles, net of taxes |  |  |  |  | $ (9)
Foreign currency translation adjustments |  | (48) | (141) | 77 |
Unrealized gains |  | 551 | (495) | 146 |
Reclassification adjustments to income |  | (267) | 627 | (597) |
Other losses |  | (5) | (2) | 5 |
Income taxes |  | 10 | (70) | 161 |
Ending Balance |  | $ (528) | $ (769) | $ (679) |

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