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Income Taxes Income Taxes (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]              
Deferred Tax Liabilities, Net $ 241     $ 3,601 $ 241    
One-time transaction tax post-1986 E&P           $ 1,044  
Deferred tax assets, net of valuation allowance 249     4,391 249    
Income Tax Examination, Penalties and Interest Accrued 11     19 11    
Unrecognized Tax Benefits 427     455 427 1,238 $ 1,095
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 332     355 332 1,150  
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions       30 79 134  
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions       45 4 16  
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions       (34) (433) (3)  
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities   $ (303)   (4) (459) (2)  
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations       (9) (3) (2)  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 416     449 416    
Deferred Tax Assets, Net, Current 161     195 161    
Deferred Tax Assets, Net, Noncurrent 87     4,196 87    
Deferred Tax Assets, Inventory 18     0 18    
Deferred Tax Assets, Operating Loss Carryforwards 450     545 450    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals 258     258 258    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges 12     20 12    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies 221     168 221    
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses 28     42 28    
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 106     121 106    
Federal benefit of uncertain tax positions 10     10 10    
Deferred Tax Assets, Goodwill and Intangible Assets 0     3,447 0    
Deferred Tax Assets, Other 37     0 37    
Deferred Tax Assets, Gross 1,140     4,611 1,140    
Deferred Tax Assets, Valuation Allowance (344)     (915) (344)    
Change in Deferred Tax Assets, Valuation Allowance       571      
Deferred Tax Liabilities, Noncurrent (328)     (595) (328)    
Deferred Tax Liabilities, Property, Plant and Equipment 25     16 25    
Deferred Tax Liabilities, Derivatives 44     52 44    
Deferred Tax Liabilities, Goodwill and Intangible Assets, Intangible Assets 968     0 968    
Deferred Tax Liabilities, Inventory 0     2 0    
Deferred Tax Liabilities, Other 0     25 0    
Deferred Tax Liabilities, Gross 1,037     95 1,037    
Deferred Tax Liabilities 328     595 328    
Current Federal Tax Expense (Benefit)       120 (221) 320  
Income (Loss) from Continuing Operations before Income Taxes, Domestic       (1,145) 35 (408)  
Income (Loss) from Continuing Operations before Income Taxes, Foreign       1,832 1,387 1,341  
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest       687 1,422 933  
Current State and Local Tax Expense (Benefit)       54 (27) 9  
Current Foreign Tax Expense (Benefit)       101 160 255  
Current Income Tax Expense (Benefit)       275 (87) 584  
Deferred Federal Income Tax Expense (Benefit)       (146) (124) 272  
Deferred State and Local Income Tax Expense (Benefit)       (18) 4 1  
Deferred Foreign Income Tax Expense (Benefit)       (4,124) (42) (28)  
Deferred Income Tax Expense (Benefit)       (4,288) (162) 244  
Deferred Tax Assets, Operating Loss Carryforwards, Foreign $ 42     105 42    
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory       4,102      
deferred tax asset, Valuation allowance, intra-entity       542      
Other Comprehensive Income (Loss), Tax       13 37 63  
Free Trade Zone Regime Tax Incentive       $ 173 $ 146 $ 127  
Free Trade Zone Regime Tax Incentive Per Share $ 0.10     $ 0.12 $ 0.10 $ 0.09  
Gross interest and penalties recognized in period       $ (643)      
Income Tax Examination, Penalties and Interest Expense       1 $ 498 $ (154)  
Deferred Tax Assets, Prepaid on Intercompany Profit $ 161     195 161    
Net Deferred Tax Liabilities and Prepaid on Intercompany Profit (80)     3,796 (80)    
Deferred Tax Assets, Net of Valuation Allowance 796     $ 3,696 $ 796    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       21.00% 21.00% 35.00%  
TCJA benefit recognized         $ 67    
Tax Cuts and Jobs Act, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Liability         856    
One-time transaction tax post-1986 E&P - net payment       $ 499      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued   $ 307          
Tax Adjustments, Settlements, and Unusual Provisions 90       250    
Net Settlement Payment to IRS $ 93       93    
transition tax payment remaining       420      
tax expense on state income taxes, USD E&P accumulated       18      
Income Tax Expense (Benefit)       $ (4,013) $ (249) $ 828  
Subsequent Event [Member]              
Operating Loss Carryforwards [Line Items]              
Potential Reduction In Unrecognized Tax Benefits Over Next Twelve Months As Result Of Concluding Certain Matters     $ 98