Debt and Banking Arrangements Long-Term Debt Issuances and Retirements (Details 1) - 7.625% Senior Unsecured Notes Due 2019 [Member] - Williams Companies Inc [Member] $ in Millions	Jul. 15, 2019 USD ($)
Debt Instrument [Line Items]
Extinguishment of Debt, Amount	$ 32
Long-term debt interest rate	7.625%

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant