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Income Taxes Income Taxes (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]            
Deferred tax assets, net of valuation allowance     $ 155 $ 536    
Incremental tax liability asserted by IRS     1,162      
Income Tax Examination, Penalties and Interest Accrued     572 500    
Unrecognized Tax Benefits     1,095 1,056 $ 1,047 $ 1,102
Unrecognized Tax Benefits that Would Impact Effective Tax Rate     1,006 900 903  
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions     47 32 44  
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions     14 38 3  
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions     (17) (36) (87)  
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities     (3) (18) (5)  
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations     (2) (7) (10)  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic     724 500    
Deferred Tax Assets, Net, Current     75 496    
Deferred Tax Assets, Net, Noncurrent     80 40    
Deferred Tax Assets, Inventory     37 49    
Deferred Tax Assets, Operating Loss Carryforwards     798 742    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals     228 232    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges     14 17    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies     752 689    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses     17 7    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost     142 138    
Federal benefit of uncertain tax positions     238 197    
Deferred Tax Assets, Other     42 39    
Deferred Tax Assets, Gross     2,268 2,110    
Deferred Tax Assets, Valuation Allowance     (446) (499)    
Change in Deferred Tax Assets, Valuation Allowance     (53)      
Deferred Tax Liabilities, Current     0 2    
Deferred Tax Liabilities, Noncurrent     18 735    
Deferred Tax Liabilities, Property, Plant and Equipment     42 44    
Deferred Tax Liabilities, Derivatives     67 82    
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets     1,651 1,749    
Deferred Tax Liabilities, Other     1,760 1,875    
Deferred Tax Assets, Net     62      
Deferred Tax Liabilities     18 737    
Deferred Tax Liabilities       (264)    
Deferred Tax Liabilities, Gross     1,760 1,875    
Current Federal Tax Expense (Benefit)     31 59 (2)  
Income (Loss) from Continuing Operations before Income Taxes, Domestic     (1,019) (1,623) (1,263)  
Income (Loss) from Continuing Operations before Income Taxes, Foreign     1,196 973 754  
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest     177 (650) (509)  
Current State and Local Tax Expense (Benefit)     6 3 (5)  
Current Foreign Tax Expense (Benefit)     136 132 111  
Current Income Tax Expense (Benefit)     173 194 104  
Deferred Federal Income Tax Expense (Benefit)     (337) (545) (458)  
Deferred State and Local Income Tax Expense (Benefit)     (14) (41) (23)  
Deferred Foreign Income Tax Expense (Benefit)     8 (19) (13)  
Deferred Income Tax Expense (Benefit)     (343) (605) (494)  
Income tax (benefit) expense     (170) (411) (390)  
Deferred Tax Assets, Operating Loss Carryforwards, Foreign     172 273    
Other Comprehensive Income (Loss), Tax     9 25 21  
Deferred Tax Liabilities, Undistributed Foreign Earnings     9,800      
Free Trade Zone Regime Tax Incentive     $ 123 7 7  
Free Trade Zone Regime Tax Incentive Per Share     $ 0.09      
Gross interest and penalties recognized in period     $ 72      
Income Tax Examination, Penalties and Interest Expense     46 37 $ 26  
Deferred Tax Assets, Prepaid on Intercompany Profit     75 63    
Net Deferred Tax Assets, Prepaid on Intercompany Profit     137      
Net Deferred Tax Liabilities and Prepaid on Intercompany Profit     137 (201)    
Deferred Tax Assets, Net of Valuation Allowance     1,822 1,611    
operating loss carryforwards, domestic     $ 76 $ 32    
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   $ 758