Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Agreement to Acquire Anadarko Petroleum Corporation (Details) $ / shares in Units, $ in Billions	Apr. 12, 2019 $ / shares	Dec. 31, 2018 USD ($)
Anadarko Petroleum Corporation
Subsequent Event [Line Items]
Long-term Debt \| $		$ 16.4
Subsequent Event \| Anadarko Petroleum Corporation
Subsequent Event [Line Items]
Conversion ratio of outstanding shares	0.3869
Subsequent Event \| Anadarko Petroleum Corporation
Subsequent Event [Line Items]
Share price (USD per share) \| $ / shares	$ 16.25