XML 116 R103.htm IDEA: XBRL DOCUMENT v3.10.0.1

Income Taxes NOL and Tax Credit Carryforwards (Details) $ in Millions	Dec. 31, 2018 USD ($)
United States
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	$ 943
State [Member]
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	140
Tax credit carryforwards	12
United Kingdom
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	13
Luxembourg [Member]
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	18
Within 5 years [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	0
Within 5 years [Member] | State [Member]
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	30
Tax credit carryforwards	3
Within 5 years [Member] | United Kingdom
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	0
Within 5 years [Member] | Luxembourg [Member]
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	0
Within 5-20 years [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	943
Within 5-20 years [Member] | State [Member]
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	110
Tax credit carryforwards	9
Within 5-20 years [Member] | United Kingdom
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	0
Within 5-20 years [Member] | Luxembourg [Member]
NOL and Tax Credit Carryforwards [Line Items]
Operating loss carryforwards	0
Foreign Tax Credits [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	37
Foreign Tax Credits [Member] | Within 5 years [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	13
Foreign Tax Credits [Member] | Within 5-20 years [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	24
Research Tax Credit Carryforward [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	1
Research Tax Credit Carryforward [Member] | Within 5 years [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	0
Research Tax Credit Carryforward [Member] | Within 5-20 years [Member] | United States
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	1
Economic Zone Credit [Member] | Poland [Member]
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	2
Economic Zone Credit [Member] | Within 5 years [Member] | Poland [Member]
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	0
Economic Zone Credit [Member] | Within 5-20 years [Member] | Poland [Member]
NOL and Tax Credit Carryforwards [Line Items]
Tax credit carryforwards	$ 2

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ValuationAllowanceLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_LU
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ati_ExpirationPeriodAxis=ati_Within5yearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ati_ExpirationPeriodAxis=ati_Within520yearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=ati_ForeignTaxCreditsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=us-gaap_ResearchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=ati_EconomicZoneCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=country_PL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: