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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense (Benefit) | Total income tax expense for the years ended December 31, 2017, 2016 and 2015 is allocated as follows (in millions):
| 2017 |  | 2016 |  | 2015
Tax expense per statements of earnings | $ | (319 | ) |  | $ | 317 |  |  | $ | 379 |
Tax expense attributable to discontinued operations | — |  |  | 1 |  |  | (2 | )
Unrealized (loss) gain on foreign currency translation | — |  |  | 30 |  |  | — |
Other components of other comprehensive income | (11 | ) |  | 1 |  |  | (5 | )
Total income tax expense (benefit) allocated to other comprehensive income | (11 | ) |  | 31 |  |  | (5 | )
Tax benefit from exercise of stock options | — |  |  | (32 | ) |  | (29 | )
Total income tax expense | $ | (330 | ) |  | $ | 317 |  |  | $ | 343 |
Income tax expense (benefit) attributable to continuing operations for the years ended December 31, 2017, 2016 and 2015 consists of the following (in millions):
| 2017 |  | 2016 |  | 2015
Current provision: |  |  |  |  |  |  |  |
Federal | $ | 476 |  |  | $ | 308 |  |  | $ | 248 |
State | 81 |  |  | 54 |  |  | 33 |
Foreign | 127 |  |  | 131 |  |  | 52 |
Total current provision | $ | 684 |  |  | $ | 493 |  |  | $ | 333 |
Deferred provision (benefit): |  |  |  |  |  |  |  |
Federal | $ | (983 | ) |  | $ | (147 | ) |  | $ | 50 |
State | (21 | ) |  | (12 | ) |  | 5 |
Foreign | 1 |  |  | (17 | ) |  | (9 | )
Total deferred provision | (1,003 | ) |  | (176 | ) |  | 46 |
Total provision for income taxes | $ | (319 | ) |  | $ | 317 |  |  | $ | 379 |
Schedule of Pre-tax Income from Continuing Operations | The provision for income taxes is based on pre-tax income from continuing operations, which is as follows for the years ended December 31, 2017, 2016 and 2015 (in millions):
| 2017 |  | 2016 |  | 2015
United States | $ | 580 |  |  | $ | 571 |  |  | $ | 864 |
Foreign | 456 |  |  | 335 |  |  | 173 |
Total | $ | 1,036 |  |  | $ | 906 |  |  | $ | 1,037 |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of the federal statutory income tax rate to the Company’s effective income tax rate for the years ended December 31, 2017, 2016 and 2015 is as follows:
| 2017 |  | 2016 |  | 2015
Federal statutory income tax rate | 35.0 | % |  | 35.0 | % |  | 35.0 | %
State income taxes | 2.5 |  |  | 3.0 |  |  | 4.6 |
Federal benefit of state taxes | (0.9 | ) |  | (1.0 | ) |  | (1.6 | )
Foreign rate differential | (4.8 | ) |  | (3.0 | ) |  | (2.6 | )
Tax Cuts and Jobs Act of 2017 | (70.9 | ) |  | — |  |  | — |
Book basis in excess of tax basis for dispositions | 17.4 |  |  | — |  |  | — |
Tax benefit from stock-based compensation | (6.3 | ) |  | — |  |  | — |
Other | (2.8 | ) |  | 1.0 |  |  | 1.1 |
Effective income tax rate | (30.8 | )% |  | 35.0 | % |  | 36.5 | %
Schedule of Deferred Income Tax Assets and Liabilities | The significant components of deferred income tax assets and liabilities as of December 31, 2017 and 2016 consist of the following (in millions):
| 2017 |  | 2016
Deferred income tax assets: |  |  |  |  |
Net operating loss carryforwards | $ | 130 |  |  | $ | 223 |
Employee benefit accruals | 69 |  |  | 111 |
Other deferred tax assets | 106 |  |  | 151 |
Total gross deferred income tax assets | 305 |  |  | 485 |
Less valuation allowance | (129 | ) |  | (177 | )
Total deferred income tax assets | 176 |  |  | 308 |
Deferred income tax liabilities: |  |  |  |  |
Amortization of goodwill and intangible assets | 1,468 |  |  | 2,464 |
Deferred contract costs | 96 |  |  | 131 |
Other deferred tax liabilities | 90 |  |  | 75 |
Total deferred income tax liabilities | 1,654 |  |  | 2,670 |
Net deferred income tax liability | $ | 1,478 |  |  | $ | 2,362 |
Deferred income taxes have been classified in the Consolidated Balance Sheets as of December 31, 2017 and 2016 as follows (in millions):
| 2017 |  | 2016
Current assets | $ | — |  |  | $ | 101 |
Noncurrent assets (included in other noncurrent assets) | 30 |  |  | 25 |
Total deferred income tax assets | 30 |  |  | 126 |
Current liabilities (included in accounts payable and accrued liabilities) | — |  |  | (4 | )
Noncurrent liabilities | (1,508 | ) |  | (2,484 | )
Total deferred income tax liabilities | (1,508 | ) |  | (2,488 | )
Net deferred income tax liability | $ | (1,478 | ) |  | $ | (2,362 | )
Schedule of Unrecognized Tax Benefits Roll Forward | The following table reconciles the gross amounts of unrecognized tax benefits at the beginning and end of the period (in millions):
| Gross Amount
Amounts of unrecognized tax benefits as of January 1, 2016 | $ | 98 |
Amount of decreases due to lapse of the applicable statute of limitations | (4 | )
Amount of decreases due to settlements | (23 | )
Increases as a result of tax positions taken in the current period | 2 |
Increases as a result of tax positions taken in a prior period | 14 |
Amount of unrecognized tax benefit as of December 31, 2016 | 87 |
Amount of decreases due to lapse of the applicable statute of limitations | (12 | )
Amount of decreases due to settlements | (19 | )
Increases as a result of tax positions taken in the current period | 5 |
Increases as a result of tax positions taken in a prior period | 14 |
Amount of unrecognized tax benefit as of December 31, 2017 | $ | 75 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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