Income Taxes (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Current income taxes:
Federal		$ 1		$ 32		$ 19
Foreign		(167)		(426)		(428)
State		0		(9)		(15)
Total current		(166)		(403)		(424)
Deferred income taxes:
Federal		372		383		286
Foreign		2		(36)		9
State		70		49		(28)
Total deferred		444		396		267
Income tax (provision) benefit		278		(7)		(157)
The United States and foreign components of income from continuing operations before income taxes [Abstract]
United States		(3,031)		(1,517)		1,097
Foreign		(189)		395		717
Income (loss) from continuing operations before income taxes		$ (3,220)		$ (1,122)		$ 1,814
Reconciliations between the actual provision for income taxes on continuing operations [Abstract]
United States statutory rate		21.00%		21.00%		21.00%
Impact of impairments and other charges		(12.30%)		(20.90%)		0.00%
Adjustments of prior year taxes		0.70%		13.00%		2.00%
Valuation allowance against tax assets		0.90%		(10.70%)		(16.20%)
State income taxes		0.00%		(1.30%)		1.90%
Impact of foreign income taxed at different rates		(1.10%)		0.80%		(3.00%)
Venezuela adjustment		0.00%		0.00%		5.70%
Impact of U.S. tax reform		0.00%		0.00%		(2.60%)
Other items, net		(0.60%)		(2.50%)		(0.10%)
Total effective tax rate on continuing operations		8.60%		(0.60%)		8.70%
Gross deferred tax assets:
Net operating loss carryforwards		$ 1,691		$ 1,301
Foreign tax credit carryforwards		945		877
Research and development tax credit carryforwards		196		198
Employee compensation and benefits		237		215
Accrued Liabilities		263		316
Other		469		382
Total gross deferred tax assets		3,801		3,289
Gross deferred tax liabilities:
Depreciation and amortization		7		373
Operating lease right-of-use assets		86		109
Other		155		58
Total gross deferred tax liabilities		248		540
Valuation allowances		1,394		1,082
Net deferred income tax asset		2,159		1,667
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration		1,800
Unrecognized Tax Benefits, Period Increase (Decrease)		133
Unrecognized Tax Benefits
Beginning Balance		425	[1]	417		$ 333
Change in prior year tax positions		(66)				(32)
Change in prior year tax positions				25
Change in current year tax positions		16		29		63
Cash settlements with taxing authorities		(3)		(4)		(7)
Lapse of statute of limitations		(17)		(42)		(4)
Ending balance		355	[1],[2]	425	[1]	417
Interest and Penalties
Beginning balance		70		67		60
Change in prior year tax positions		6		11		11
Change in current year tax positions		0		0		0
Cash settlements with taxing authorities		0		0		(2)
Lapse of statute of limitations		(5)		(8)		(2)
Ending balance		71		70		67
Remaining balance if resolved in our favor would positively impact the effective tax rate		224		271
Portion of unrecognized tax benefits that could be resolved within the next 12 months		17
Impairments and other charges	[3]	(3,799)		(2,506)		(265)
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		312
Net operating loss carryforwards		1,691		1,301
Foreign tax credit carryforwards		945		877
Research and development tax credit carryforwards		196		198
Deferred Tax Assets, Operating Loss Carryforwards, Domestic, Not Subject to Expiration		312
Deferred Tax Assets, Operating Loss Carryforwards, Foreign, Not Subject to Expiration		435
Deferred Tax Assets, Tax Credit Carryforwards, Foreign, Not Subject to Expiration		0
Deferred Tax Assets, Tax Credit Carryforwards, Research, Not Subject to Expiration		0
Deferred Tax Assets, Operating Loss Carryforwards and Tax Credit Carryforwards, Not Subject to Expiration		747
Deferred Tax Assets, Estimated Tax Credit Carryforwards, Research		196
Deferred Tax Assets, Estimated Tax Credit Carryforwards, Foreign		1,090
Deferred Tax Assets, Estimated Operating Loss Carryforwards, Foreign		838
Deferred Tax Assets, Estimated Operating Loss Carryforwards, Domestic		986
Deferred Tax Assets, Operating Loss Carryforwards and Tax Credit Carryforwards		3,110
2021-2025
Gross deferred tax assets:
Foreign tax credit carryforwards		533
Research and development tax credit carryforwards		0
Interest and Penalties
U.S. Net Operating Loss		2
Foreign Net Operating Loss		186
Foreign tax credit carryforwards		533
Research and development tax credit carryforwards		0
Deferred Tax Assets, Gross		721
2026-2030
Gross deferred tax assets:
Foreign tax credit carryforwards		557
Research and development tax credit carryforwards		0
Interest and Penalties
U.S. Net Operating Loss		7
Foreign Net Operating Loss		125
Foreign tax credit carryforwards		557
Research and development tax credit carryforwards		0
Deferred Tax Assets, Gross		689
2031-2041
Gross deferred tax assets:
Foreign tax credit carryforwards		0
Research and development tax credit carryforwards		196
Interest and Penalties
U.S. Net Operating Loss		665
Foreign Net Operating Loss		92
Foreign tax credit carryforwards		0
Research and development tax credit carryforwards		196
Deferred Tax Assets, Gross		953
VENEZUELA
Interest and Penalties
Impairments and other charges	[3]					$ (265)
All Other Countries [Domain]
Interest and Penalties
Remaining balance if resolved in our favor would positively impact the effective tax rate		18		$ 25
Deferred tax assets [Member] | Foreign
Interest and Penalties
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		16
Tax credits [Member] | Foreign
Interest and Penalties
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 296

[1] Includes $18 million as of December 31, 2020 and $25 million as of December 31, 2019 in foreign unrecognized tax benefits that would give rise to a United States tax credit. As of December 31, 2020 and December 31, 2019, a net $224 million and $271 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 $17 million that could be resolved within the next 12 months.

[3] Impairments and other charges are as follows:     -For the year ended December 31, 2020, amount includes approximately $2.4 billion attributable to Completion and Production, $1.4 billion attributable to Drilling and Evaluation, and $62 million attributable to Corporate and other. -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, we recorded aggregate charges of $265 million to write-down our investment in Venezuela.