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Income Taxes, Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |  |
Country |  | $ 1,499 |  | $ 488 | $ 1,577
U.S. state / Canadian provincial |  | 95 |  | 47 | 128
Total current |  | 1,594 |  | 535 | 1,705
Deferred: |  |  |  |  |
Country |  | (2,551) |  | 238 | 151
U.S. state / Canadian provincial |  | 8 |  | (8) | 14
Total deferred |  | (2,543) |  | 230 | 165
Income tax expense (benefit) | $ (42) | (949) |  | 765 | 1,870
Deferred income tax benefit included in tax reform |  | 2,643 |  |  |
U.S. [Member] |  |  |  |  |
Current: |  |  |  |  |
Country |  | 1,305 |  | 294 | 1,513
U.S. state / Canadian provincial |  | 34 |  | 12 | 85
Total current |  | 1,339 | [1] | 306 | 1,598
Deferred: |  |  |  |  |
Country |  | (2,522) |  | 203 | 143
U.S. state / Canadian provincial |  | 23 |  | (4) | (16)
Total deferred |  | (2,499) | [2] | 199 | 127
Income tax expense (benefit) |  | (1,160) |  | 505 | 1,725
Current income tax expense included in tax reform adjustment |  | 781 |  |  |
Deferred income tax benefit included in tax reform |  | 2,600 |  |  |
International [Member] |  |  |  |  |
Current: |  |  |  |  |
Country |  | 194 |  | 194 | 64
U.S. state / Canadian provincial |  | 61 |  | 35 | 43
Total current |  | 255 |  | 229 | 107
Deferred: |  |  |  |  |
Country |  | (29) |  | 35 | 8
U.S. state / Canadian provincial |  | (15) |  | (4) | 30
Total deferred |  | (44) |  | 31 | 38
Income tax expense (benefit) |  | $ 211 |  | $ 260 | $ 145
[1] | Current income tax expense includes the effect of our $781 million Tax Reform adjustment as described in “Tax Reform” above.
[2] | Deferred income tax benefit includes the effect of our $2.6 billion Tax Reform adjustment as described in “Tax Reform” above.

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