Income Taxes Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred Tax Liabilities, Net			$ (103)
One-time transaction tax post-1986 E&P			1,044
Deferred tax assets, net of valuation allowance			154	$ 155
Incremental tax liability asserted by IRS			1,162
Income Tax Examination, Penalties and Interest Accrued			655	572
Unrecognized Tax Benefits			1,238	1,095	$ 1,056	$ 1,047
Unrecognized Tax Benefits that Would Impact Effective Tax Rate			1,150	1,006	900
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions			134	47	32
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions			16	14	38
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions			(3)	(17)	(36)
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities			(2)	(3)	(18)
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations			(2)	(2)	(7)
Deferred Tax Assets, Operating Loss Carryforwards, Domestic			338	724
Deferred Tax Assets, Net, Current			66	75
Deferred Tax Assets, Net, Noncurrent			88	80
Deferred Tax Assets, Inventory			29	37
Deferred Tax Assets, Operating Loss Carryforwards			478	798
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals			179	228
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges			12	14
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies			383	752
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses			32	17
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost			104	142
Federal benefit of uncertain tax positions			163	238
Deferred Tax Assets, Other			48	42
Deferred Tax Assets, Gross			1,428	2,268
Deferred Tax Assets, Valuation Allowance			(465)	(446)
Change in Deferred Tax Assets, Valuation Allowance			19
Deferred Tax Liabilities, Noncurrent			191	18
Deferred Tax Liabilities, Property, Plant and Equipment			33	42
Deferred Tax Liabilities, Derivatives			5	67
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets			1,028	1,651
Deferred Tax Liabilities, Other			1,066	1,760
Deferred Tax Assets, Net				62
Deferred Tax Liabilities			191	18
Deferred Tax Liabilities, Gross			1,066	1,760
Current Federal Tax Expense (Benefit)			320	31	59
Income (Loss) from Continuing Operations before Income Taxes, Domestic			(408)	(1,019)	(1,623)
Income (Loss) from Continuing Operations before Income Taxes, Foreign			1,341	1,196	973
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest			933	177	(650)
Current State and Local Tax Expense (Benefit)			9	6	3
Current Foreign Tax Expense (Benefit)			255	136	132
Current Income Tax Expense (Benefit)			584	173	194
Deferred Federal Income Tax Expense (Benefit)			272	(337)	(545)
Deferred State and Local Income Tax Expense (Benefit)			1	(14)	(41)
Deferred Foreign Income Tax Expense (Benefit)			(28)	8	(19)
Deferred Income Tax Expense (Benefit)			244	(343)	(605)
Income tax (benefit) expense			861
Deferred Tax Assets, Operating Loss Carryforwards, Foreign			149	172
Other Comprehensive Income (Loss), Tax			63	9	25
Free Trade Zone Regime Tax Incentive			$ 127	123	7
Free Trade Zone Regime Tax Incentive Per Share			$ 0.09
Gross interest and penalties recognized in period			$ 83
Income Tax Examination, Penalties and Interest Expense			154	46	$ 37
Deferred Tax Assets, Prepaid on Intercompany Profit			66	75
Net Deferred Tax Assets, Prepaid on Intercompany Profit			(37)
Net Deferred Tax Liabilities and Prepaid on Intercompany Profit			(37)	137
Deferred Tax Assets, Net of Valuation Allowance			$ 963	$ 1,822
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%	35.00%	35.00%
Deferred tax asset TCJA remeasurement benefit			$ 99
One-time transaction tax post-1986 E&P - net payment			$ 463
Subsequent Event [Member]
Operating Loss Carryforwards [Line Items]
Litigation Settlement, Amount		$ 275
Potential Reduction In Unrecognized Tax Benefits Over Next Twelve Months As Result Of Concluding Certain Matters	$ 757
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%