Disputes, Litigation and Contingencies (Details) $ in Millions				3 Months Ended				9 Months Ended	12 Months Ended
	Sep. 27, 2016	Nov. 04, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2010 lawsuit	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Estimated litigation liability						$ 181				$ 91
Recorded unconditional purchase obligation										122
Other Current Liabilities
Loss Contingencies [Line Items]
Recorded unconditional purchase obligation										52
Other Noncurrent Liabilities
Loss Contingencies [Line Items]
Recorded unconditional purchase obligation										47
Liabilities Held for Sale
Loss Contingencies [Line Items]
Recorded unconditional purchase obligation										23
Fair Value Guarantee | Other Noncurrent Liabilities
Loss Contingencies [Line Items]
Leveraged leases, net investment in leveraged leases disclosure, residual value of leased assets						28
Neff v. Brady, et al.
Loss Contingencies [Line Items]
Number of actions filed (in lawsuits) | lawsuit									3
Freedman v. Weatherford International Ltd., et al.
Loss Contingencies [Line Items]
Litigation settlement, amount			$ 120
Payments for legal settlements		$ 120
Insurance settlements receivable							$ 4	$ 23
U.S. SEC and DOJ Investigation
Loss Contingencies [Line Items]
Loss contingency accrual							$ 65	$ 140
Period of time in which reports and certifications are delivered regarding tax internal controls	2 years
U.S. SEC and DOJ Investigation | Settlement payments due 21 days from settlement
Loss Contingencies [Line Items]
Payments for legal settlements						$ 50
U.S. SEC and DOJ Investigation | Settlement payments due in 120 days [Domain]
Loss Contingencies [Line Items]
Payments for legal settlements					$ 30
U.S. SEC and DOJ Investigation | Settlement payments due in 240 days
Loss Contingencies [Line Items]
Payments for legal settlements				$ 30
U.S. SEC and DOJ Investigation | Settlement payments due in 360 days
Loss Contingencies [Line Items]
Loss contingency accrual										$ 30
Spitzer
Loss Contingencies [Line Items]
Loss contingency accrual											$ 36