v3.19.3.a.u2
Income Taxes - Textuals (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 02, 2019
Income Tax Examination [Line Items]            
Deferred taxes Included in long-term liabilities $ 4,634,000,000   $ 4,634,000,000 $ 5,021,000,000    
Increase (decrease) in valuation allowance 6,642,000,000   7,174,000,000      
Deferred Tax Assets Net 4,479,000,000   4,479,000,000 3,702,000,000   $ 151,000,000
U.S. foreign tax credits 7,696,000,000   7,696,000,000     $ 6,642,000,000
Undistributed Earnings of Foreign Subsidiaries 4,196,000,000   4,196,000,000      
Estimated Tax Payable On Undistributed Unremitted Foreign Income     210,000,000      
Unrecognized tax benefits that if recognized, would affect effective tax rate 1,100,000,000   1,100,000,000 1,081,000,000 $ 882,000,000  
Accrued liabilities for interest and penalties 42,000,000   42,000,000 45,000,000 54,000,000  
Interest and penalties (benefiting) charging earnings     3,000,000 4,000,000 0  
Tax Legislation     0 (10,000,000) (852,000,000)  
Tax Cuts and Jobs Act, Decrease in Deferred Tax Liability due to Transition Tax     10,000,000 908,000,000    
One time tranisition tax       (10,000,000) 56,000,000  
Adjustment to valuation allowances     (225,000,000) (26,000,000) 0  
Income Tax Expense (Benefit)     2,267,000,000 3,668,000,000 (1,822,000,000)  
Worthless Security Deduction     9,000,000 36,000,000 962,000,000  
Income Tax Loss (Benefit) related to U.K. disposition     (732,000,000) (150,000,000) 0  
Malaysia Deepwater Tax Credits Incentive     164,000,000 0 0  
Capital Loss Carryforward 202,000,000   202,000,000      
Noncurrent Asset            
Income Tax Examination [Line Items]            
Deferred taxes Included in long-term assets 184,000,000   184,000,000 442,000,000    
Noncurrent Liabilities            
Income Tax Examination [Line Items]            
Deferred taxes Included in long-term liabilities 4,634,000,000   4,634,000,000 5,021,000,000    
Clair Field [Member]            
Income Tax Examination [Line Items]            
Gain (Loss) on Sale of Oil and Gas Property     1,700,000,000 $ 715,000,000    
Income Tax Expense (Benefit)     (335,000,000)      
Income Tax Loss (Benefit) related to U.K. disposition     285,000,000      
Malaysia Deepwater Tax Credits Incentive   $ 164,000,000        
Capital Loss Carryforward $ 2,100,000,000   $ 2,100,000,000      
Foster Creek Christina Lake (FCCL) and western Canada gas properties [Member]            
Income Tax Examination [Line Items]            
Increase (decrease) in valuation allowance         822,000,000  
Tax impact of Canada disposition         (1,277,000,000)  
Income Tax Expense (Benefit)         $ (822,000,000)