XML 66 R49.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenue - Transaction Price Allocation and Contract Balances (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Revenue |  |
Original expected duration | true |
Receivables with customers | $ 91 | $ 101

X
- Definition Amount due from contracts with customers. + References No definition available. + Details
Name: | amgp_ReceivablesFromContractsWithCustomers
Namespace Prefix: | amgp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130558-203045 + Details
Name: | us-gaap_RevenuePracticalExpedientRemainingPerformanceObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration