Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Current income taxes:
Federal		$ 32		$ 19		$ 40
Foreign		(426)		(428)		(423)
State		(9)		(15)		(14)
Total current		(403)		(424)		(397)
Deferred income taxes:
Federal		383		286		(678)
Foreign		(36)		9		(31)
State		49		(28)		(25)
Total deferred		396		267		(734)
Income tax provision		(7)		(157)		(1,131)
The United States and foreign components of income from continuing operations before income taxes [Abstract]
United States		(1,517)		1,097		694
Foreign		395		717		(12)
Income (loss) from continuing operations before income taxes		$ (1,122)		$ 1,814		$ 682
Reconciliations between the actual provision for income taxes on continuing operations [Abstract]
United States statutory rate		21.00%		21.00%		35.00%
Impact of impairments and other charges		(20.90%)		0.00%		0.00%
Adjustments of prior year taxes		13.00%		2.00%		(2.30%)
Valuation allowance against tax assets		(10.70%)		(16.20%)		(6.20%)
State income taxes		(1.30%)		1.90%		1.70%
Impact of foreign income taxed at different rates		0.80%		(3.00%)		(18.30%)
Venezuela adjustment		0.00%		5.70%		36.60%
Impact of U.S. tax reform		0.00%		(2.60%)		113.00%
Undistributed foreign earnings		0.00%		0.00%		3.80%
Other items, net		(2.50%)		(0.10%)		2.50%
Total effective tax rate on continuing operations		(0.60%)		8.70%		165.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount		$ 291
Gross deferred tax assets:
Net operating loss carryforwards		1,301		$ 1,466
Foreign tax credit carryforwards		877		728
Research and development tax credit carryforwards		198		139
Employee compensation and benefits		215		242
Accrued Liabilities		316		101
Other		382		265
Total gross deferred tax assets		3,289		2,941
Gross deferred tax liabilities:
Depreciation and amortization		373		635
Operating lease right-of-use assets		109		0
Undistributed Foreign Earnings		2		2
Other		56		64
Total gross deferred tax liabilities		540		701
Valuation allowances		1,082		913
Net deferred income tax asset		1,667		1,327
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		1,500
Unrecognized Tax Benefits, Period Increase (Decrease)		200
Unrecognized Tax Benefits
Beginning Balance		417	[1]	333		$ 427
Change in prior year tax positions						(108)
Change in prior year tax positions		25		32
Change in current year tax positions		29		63		24
Cash settlements with taxing authorities		(4)		(7)		(6)
Lapse of statute of limitations		(42)		(4)		(4)
Ending balance		425	[1],[2]	417	[1]	333
Interest and Penalties
Beginning balance		67		60		61
Change in prior year tax positions		11		11		0
Change in current year tax positions		0		0		2
Cash settlements with taxing authorities		0		(2)		0
Lapse of statute of limitations		(8)		(2)		(3)
Ending balance		70		67		60
Remaining balance if resolved in our favor would positively impact the effective tax rate		271		399
Portion of unrecognized tax benefits that could be resolved within the next 12 months		30
Impairments and other charges	[3]	(2,506)		(265)		(647)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		169
Years 2020-2024
Gross deferred tax liabilities:
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		157
Years 2025-2029
Gross deferred tax assets:
Foreign tax credit carryforwards		967
Gross deferred tax liabilities:
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		219
Years 2030-2040
Gross deferred tax assets:
Research and development tax credit carryforwards		198
Gross deferred tax liabilities:
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		755
VENEZUELA
Interest and Penalties
Impairments and other charges	[3]			(265)		$ (647)
All Other Countries [Domain]
Interest and Penalties
Remaining balance if resolved in our favor would positively impact the effective tax rate		25		$ 18
Deferred tax assets [Member] | Foreign
Interest and Penalties
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		85
Tax credits [Member] | Foreign
Interest and Penalties
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 84

[1] Includes $25 million as of December 31, 2019 and $18 million as of December 31, 2018 in foreign unrecognized tax benefits that would give rise to a United States tax credit. As of December 31, 2019 and December 31, 2018, a net $271 million and $399 million without a net operating loss carryforward offset, respectively, of unrecognized tax benefits would positively impact the effective tax rate and be recognized as additional tax benefits in our statement of operations if resolved in our favor.

[2] Includes $30 million that could be resolved within the next 12 months.

[3] Impairments and other charges are as follows: -For the year ended December 31, 2019, amount includes approximately $1.6 billion attributable to Completion and Production, $849 million attributable to Drilling and Evaluation, and $56 million attributable to Corporate and other. -For the years ended December 31, 2018 and December 31, 2017, we recorded aggregate charges of $265 million and $647 million, respectively, to write-down our investment in Venezuela.