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Income Taxes (Deferred) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Deferred tax assets |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 571 | $ 479
Interest expense limitation |  |  |  | 77 | 76
Accrued payroll expenses not currently deductible |  |  |  | 45 | 49
Deferred income |  |  |  | 41 | 26
Loss contingencies |  |  |  | 38 | 40
United Kingdom charter limitation |  |  |  | 36 | 30
Tax credit carryforwards |  |  |  | 22 | 11
Accrued expenses |  |  |  | 16 | 44
Other |  |  |  | 24 | 13
Valuation allowance |  |  |  | (716) | (681)
Total deferred tax assets |  |  |  | 154 | 87
Deferred tax liabilities |  |  |  |  |
Depreciation |  |  |  | (361) | (62)
Contract intangible amortization |  |  |  | (23) | (22)
Other |  |  |  | (16) | (1)
Total deferred tax liabilities |  |  |  | (400) | (85)
Net deferred tax liabilities |  |  |  | (246) |
Net deferred tax assets |  |  |  |  | 2
U.S. foreign tax credit carryforwards |  |  |  | 22 | 11
NOLs that are not subject to expiration dates |  |  |  | 354 | 307
NOLs that are subject to expiration dates |  |  |  | 217 | 172
Indefinitely reinvested earnings |  |  |  | 254 |
Unrecognized deferred tax liability on indefinitely reinvested earnings |  |  |  | 13 |
Reconciliation of unrecognized tax benefits, excluding interest and penalties |  |  |  |  |
Balance, beginning of period | $ 408 | $ 222 | $ 274 |  |
Additions for prior year tax positions | 6 | 172 | 17 |  |
Additions for current year tax positions | 144 | 29 | 13 |  |
Reductions related to statute of limitation expirations and changes in law | (138) | (8) | (13) |  |
Reductions for prior year tax positions | (66) | (7) | (68) |  |
Reductions due to settlements | (19) |  | (1) |  |
Balance, end of period | 335 | 408 | 222 |  |
Unrecognized tax benefits |  |  |  |  |
Unrecognized tax benefits, excluding interest and penalties | 335 | 222 | 222 | 335 | 408
Interest and penalties |  |  |  | 34 | 106
Unrecognized tax benefits, including interest and penalties |  |  |  | 369 | $ 514
Interest and penalties related to unrecognized tax benefits recognized as a component of income tax expense | $ (72) | $ 13 | $ (9) |  |
Amount if recognized that would impact tax rate |  |  |  | $ 175 |

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- Definition Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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