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Commitments and Contingent Liabilities Rights-of-way obligations (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Class of Warrant or Right [Line Items] |
Lessee, Operating Lease, Liability, Payments, Due | $ 412
ROW |
Class of Warrant or Right [Line Items] |
Lessee, Operating Lease, Liability, Payments, Due | $ 172

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- 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
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Balance Type: | na
Period Type: | duration

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |