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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Domestic and Foreign Components of Income (Loss) Before Income Taxes | The domestic and foreign components of income (loss) before income taxes were as follows (in millions):
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Domestic |  | $ | (4,501 | ) |  | $ | (168 | ) |  | $ | (470 | )
Foreign |  |  | (1,961 | ) |  |  | 209 |  |  |  | 78 |
|  | $ | (6,462 | ) |  | $ | 41 |  |  | $ | (392 | )
Components of Provision for Income Taxes | The components of the provision for income taxes consisted of (in millions):
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | (7 | ) |  | $ | (5 | ) |  | $ | 23 |
State |  |  | 4 |  |  |  | (3 | ) |  |  | 1 |
Foreign |  |  | 60 |  |  |  | 134 |  |  |  | 161 |
Total current income tax provision |  |  | 57 |  |  |  | 126 |  |  |  | 185 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (344 | ) |  |  | 11 |  |  |  | (332 | )
State |  |  | (18 | ) |  |  | - |  |  |  | (2 | )
Foreign |  |  | (64 | ) |  |  | (74 | ) |  |  | (7 | )
Total deferred income tax provision |  |  | (426 | ) |  |  | (63 | ) |  |  | (341 | )
Total income tax provision |  | $ | (369 | ) |  | $ | 63 |  |  | $ | (156 | )
Difference Between Effective Tax Rate | The difference between the effective tax rate reflected in the provision for income taxes and the U.S. federal statutory rate was as follows (in millions):
|  | Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Federal income tax at U.S. statutory rate |  | $ | (1,357 | ) |  | $ | 9 |  |  | $ | (137 | )
Foreign income tax rate differential |  |  | (40 | ) |  |  | (3 | ) |  |  | (21 | )
Goodwill impairment |  |  | 666 |  |  |  | — |  |  |  | — |
Nondeductible expenses |  |  | 61 |  |  |  | 20 |  |  |  | 38 |
Foreign dividends, net of foreign tax credits |  |  | 163 |  |  |  | 27 |  |  |  | (132 | )
Tax rate change on timing differences |  |  | 1 |  |  |  | (7 | ) |  |  | (245 | )
Change in uncertain tax positions |  |  | (60 | ) |  |  | (5 | ) |  |  | 81 |
Prior years taxes |  |  | 3 |  |  |  | (13 | ) |  |  | (26 | )
Tax impact on foreign exchange |  |  | (2 | ) |  |  | (3 | ) |  |  | 5 |
Change in deferred tax valuation allowance |  |  | 218 |  |  |  | 49 |  |  |  | 280 |
State income taxes - net of federal benefit |  |  | (16 | ) |  |  | (3 | ) |  |  | (1 | )
Tax exempt income |  |  | (6 | ) |  |  | (5 | ) |  |  | — |
Income tax credits |  |  | — |  |  |  | (3 | ) |  |  | (4 | )
Other |  |  | — |  |  |  | — |  |  |  | 6 |
Total income tax provision |  | $ | (369 | ) |  | $ | 63 |  |  | $ | (156 | )
Significant Components of Deferred Tax Assets and Liability | Significant components of our deferred tax assets and liabilities were as follows (in millions):
|  | December 31, |
|  | 2019 |  |  | 2018 |
Deferred tax assets: |  |  |  |  |  |  |  |
Allowances and operating liabilities |  | $ | 395 |  |  | $ | 293 |
Net operating loss carryforwards |  |  | 270 |  |  |  | 182 |
Stock Compensation |  |  | 69 |  |  |  | 66 |
Tax credit carryforwards |  |  | 702 |  |  |  | 768 |
Other |  |  | 60 |  |  |  | 59 |
Valuation allowance |  |  | (1,175 | ) |  |  | (955 | )
Total deferred tax assets |  |  | 321 |  |  |  | 413 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Tax over book depreciation |  |  | 115 |  |  |  | 139 |
Capital leases |  |  | 86 |  |  |  | - |
Intangible assets |  |  | 110 |  |  |  | 688 |
Deferred income |  |  | 65 |  |  |  | 70 |
Accrued tax on unremitted earnings |  |  | 33 |  |  |  | 17 |
Other |  |  | 52 |  |  |  | 52 |
Total deferred tax liabilities |  |  | 461 |  |  |  | 966 |
Net deferred tax liability |  | $ | 140 |  |  | $ | 553 |
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):
|  | 2019 |  |  | 2018 |  |  | 2017 |
Unrecognized tax benefit at beginning of year |  | $ | 98 |  |  | $ | 132 |  |  | $ | 78 |
Gross increase for current period tax positions |  |  | — |  |  |  | 15 |  |  |  | 10 |
Gross increase for tax positions in prior years |  |  | 10 |  |  |  | 31 |  |  |  | 64 |
Gross decrease for tax positions in prior years |  |  | (60 | ) |  |  | (10 | ) |  |  | (14 | )
Cash Settlements |  |  | (3 | ) |  |  | (69 | ) |  |  | — |
Lapse of statute of limitations |  |  | (7 | ) |  |  | (1 | ) |  |  | (6 | )
Unrecognized tax benefit at end of year |  | $ | 38 |  |  | $ | 98 |  |  | $ | 132 |
Summary of Net Operating Loss Carryforwards | Net operating loss carryforwards by jurisdiction and expiration as of December 31, 2019 were as follows (in millions):
|  | Federal |  |  | State |  |  | Foreign |  |  | Total |
2020 - 2024 Expiration |  | $ | 6 |  |  | $ | 4 |  |  | $ | 73 |  |  | $ | 83 |
2025 - 2039 Expiration |  |  | 30 |  |  |  | 150 |  |  |  | 346 |  |  |  | 526 |
Unlimited Expiration |  |  | 198 |  |  |  | — |  |  |  | 406 |  |  |  | 604 |
Total Net Operating Loss (NOL) |  | $ | 234 |  |  | $ | 154 |  |  | $ | 825 |  |  | $ | 1,213 |
Tax Effected NOL |  | $ | 49 |  |  | $ | 9 |  |  | $ | 212 |  |  |  | 270 |
Valuation Allowance (VA) |  |  | (49 | ) |  |  | (9 | ) |  |  | (211 | ) |  |  | (269 | )
Tax Effected NOL Net of VA |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |

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