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Income Taxes (Deferred) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Deferred tax assets |  |  |
Net operating loss carryforwards | $ 383 | $ 365 |
Tax credit carryforwards | 33 | 23 |
Accrued payroll expenses not currently deductible | 110 | 128 |
Deferred income | 122 | 138 |
Loss contingencies | 68 | 72 |
Professional fees | 3 | 2 |
United Kingdom charter limitation | 33 | 69 |
Other | 37 | 36 |
Valuation allowance | (412) | (380) |
Total deferred tax assets | 377 | 453 |
Deferred tax liabilities |  |  |
Depreciation and amortization | (239) | (251) |
Other | (18) | (20) |
Total deferred tax liabilities | (257) | (271) |
Net deferred tax liabilities | 120 | 182 |
U.S. foreign tax credit carryforwards | 33 | 23 |
NOLs that are not subject to expiration dates | 200 | 170 |
NOLs that are subject to expiration dates | 183 | 195 |
Indefinitely reinvested earnings of subsidiaries | 2,500 |  |
Estimated taxes on unremitted earnings of subsidiaries, low end of range | 200 |  |
Estimated taxes on unremitted earnings of subsidiaries, high end of range | 250 |  |
Reconciliation of unrecognized tax benefits, excluding interest and penalties |  |  |
Balance, beginning of period | 287 | 272 | $ 331
Additions for current year tax positions | 42 | 36 | 27
Additions for prior year tax positions | 13 | 17 | 3
Reductions for prior year tax positions | (34) | (27) | (19)
Settlements | (19) | (5) | (47)
Reductions related to statute of limitation expirations | (15) | (6) | (23)
Balance, end of period | 274 | 287 | 272
Unrecognized tax benefits |  |  |
Unrecognized tax benefits, excluding interest and penalties | 274 | 287 |
Interest and penalties | 96 | 118 |
Unrecognized tax benefits, including interest and penalties | 370 | 405 |
Interest and penalties related to unrecognized tax benefits recognized as a component of income tax expense | (23) | $ (1) | $ (57)
Amount if recognized that would impact tax rate | $ 370 |  |

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