Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		$ (33)
Current income taxes:
Current Federal Tax Expense (Benefit)	$ (737)	(635)	$ 959
Current Foreign Tax Expense (Benefit)	(415)	(636)	(734)
Current State Tax Expense (Benefit)	35	51	(36)
Total current	(357)	(50)	1,729
Deferred income taxes:
Federal	1,343	(18)	83
Foreign	77	262	357
State	81	(20)	14
Total deferred	1,501	224	454
Income tax benefit (provision)	1,858	274	(1,275)
The United States and foreign components of income from continuing operations before income taxes [Abstract]
United States	(6,636)	(1,560)	3,020
Foreign	(989)	624	1,692
Income (loss) from continuing operations before income taxes	$ (7,625)	$ (936)	$ 4,712
Reconciliations between the actual provision for income taxes on continuing operations [Abstract]
United States statutory rate	35.00%	35.00%	35.00%
Impact of foreign income taxed at different rates	(3.20%)	17.00%	(5.70%)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	(5.10%)	0.00%	0.00%
Effective Income Tax Reconciliation, Foreign Exchange Loss, Percent	(0.00%)	(7.50%)	(0.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(2.10%)	(8.30%)	(3.60%)
Effective Income Tax Reconciliation, Nondeductible Expense, Acquisition Costs, Percent	0.60%	(4.50%)	0.00%
Domestic manufacturing deduction	(1.30%)	0.00%	(1.90%)
State income taxes	1.00%	2.00%	0.80%
Adjustments of prior year taxes	0.20%	1.30%	0.30%
Other items, net	(0.70%)	(5.70%)	2.20%
Total effective tax rate on continuing operations	24.40%	29.30%	27.10%
Income Tax Expense Benefit on Undistributed Foreign Earnings Not Reinvested	$ 393
Earnings of Foreign Subsidiaries No Longer Permanently Reinvested	3,400
Tax Adjustments, Settlements, and Unusual Provisions	96
Impairments and other charges	3,357	$ 2,177	$ 129
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(163)
Gross deferred tax assets:
Net operating loss carryforwards	1,647	540
Accrued Liabilities	325	392
Employee compensation and benefits	352	403
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	648	365
Other	536	359
Total gross deferred tax assets	3,508	2,059
Gross deferred tax liabilities:
Depreciation and amortization	585	1,334
Deferred Tax Liabilities, Undistributed Foreign Earnings	406	5
Other	145	109
Total gross deferred tax liabilities	1,136	1,448
Valuation allowances	453	213
Net deferred income tax asset	1,919	398
Unrecognized Tax Benefits
Beginning Balance	322	314	175
Change in prior year tax positions	44		83
Change in current year tax positions	129	62	84
Cash settlements with taxing authorities	(62)	(16)	(27)
Lapse of statute of limitations	(6)	(5)	(1)
Ending balance	427	322	314
Interest and Penalties
Beginning balance	47	56	34
Change in prior year tax positions	20	7	24
Change in current year tax positions	3	1	0
Cash settlements with taxing authorities	(8)	(15)	(1)
Lapse of statute of limitations	(1)	(2)	(1)
Ending balance	61	47	$ 56
Deferred tax liability not recognized, cumulative amount of temporary difference	4,000
Remaining balance if resolved in our favor would positively impact the effective tax rate	257	176
Unrecognized tax benefit related to an indemnification asset	5	10
Portion of unrecognized tax benefits that could be resolved within the next 12 months	15
Foreign Country
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	1,600
Years 2027-2036 [Domain]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	77
Deferred Tax Assets, Tax Credit Carryforwards, Research and Foreign That Expire	84
Years 2022-2026 [Domain]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	142
Deferred Tax Assets, Tax Credit Carryforwards, Research and Foreign That Expire	758
Years 2017-2021 [Domain]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	174
Year 2037 [Domain]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	943
All Other Countries [Domain]
Interest and Penalties
Remaining balance if resolved in our favor would positively impact the effective tax rate	$ 84	$ 67