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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents [Line Items]        
Income tax expense (benefit)   $ 382 $ 348 $ 150
Legal entity restructuring tax impact   (82) (147) 0
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, additional income tax benefit       54
Pension plan contributions, tax deductible       350
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, additional income tax expense $ 95      
Effective income tax rate reconciliation, Tax Cuts and Jobs Act, unrecognized tax benefits 55   117  
U.S. transition tax expense recognized to date     26  
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense     299  
Transition tax provision, deemed remittance     3,500  
Cash and cash equivalents as presented in our Consolidated Balance Sheets 1,498 2,924 1,952 1,498
Operating loss carryforwards   5,900    
Operating loss carryforwards, not subject to expiration   3,700    
U.S. general business credit carryforwards, including Energy Tax Credits   680 787  
Valuation allowance, deferred tax assets   214 192  
Valuation allowance, increase in deferred tax assets   15    
Unrecognized tax benefits, income tax penalties and interest expense (benefit)   10 (4) 2
Unrecognized tax benefits, income tax penalties and interest accrued $ 46 52 42 $ 46
Unrecognized tax benefits   4    
Foreign Subsidiaries        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents as presented in our Consolidated Balance Sheets   1,600    
United States Pension Benefits        
Cash and Cash Equivalents [Line Items]        
Operating loss carryforwards   512    
Net Operating Loss Carryforward        
Cash and Cash Equivalents [Line Items]        
Valuation allowance, deferred tax assets   126 111  
Other Deferred Tax Assets        
Cash and Cash Equivalents [Line Items]        
Valuation allowance, deferred tax assets   $ 88 $ 81