Income taxes - Income tax expense components (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Income tax expense: | |||
| Federal | $ (1,613) | $ (23,427) | $ 7,796 |
| State | 175 | 894 | 556 |
| Foreign | 1,117 | 1,018 | 888 |
| Total income taxes | (321) | (21,515) | 9,240 |
| Income tax expense: | |||
| Current | 5,176 | 3,299 | 6,565 |
| Deferred | (5,497) | (24,814) | 2,675 |
| Total income taxes | $ (321) | $ (21,515) | $ 9,240 |