Property, Plant and Equipment (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) Rig
Asset Impairments [Abstract]
Number of rigs evaluated for impairment \| Rig	5
Number of rigs impaired \| Rig	4
Asset impairment charge, after tax and noncontrolling interests \| $	$ 408
Operating Expenses and Other [Member]
Asset Impairments [Abstract]
Asset impairment charge \| $	$ 774

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Name:	us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration