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Debt And Lines Of Credit (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule of Debt Activity [Line Items]      
Maturities of long-term debt, 2022 $ 196    
Maturities of long-term debt, 2023 358    
Maturities of long-term debt, 2024 149    
Maturities of long-term debt, 2025 206    
Maturities of long-term debt, 2026 $ 73    
Debt covenant compliance, minimum debt to capital ratio 60.00%    
Extinguishment of Debt, Amount [1] $ 2,472 $ 1,640 $ 614
Debt Instrument, Covenant Description 9 billion    
Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.00% 3.00% 3.00%
Maximum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 9.50% 9.50% 9.50%
Commercial Paper [Member]      
Schedule of Debt Activity [Line Items]      
Revolving credit facilities available $ 1,000    
Short-term Debt 0    
Revolving Credit Facility [Member]      
Schedule of Debt Activity [Line Items]      
Revolving credit facilities available 1,500    
Receivables Securitization Program [Member]      
Schedule of Debt Activity [Line Items]      
Commercial paper-based financings agreement value 550    
Collateralized agreements, value of amount outstanding 0    
364-Day Revolving Credit Agreement [Member]      
Schedule of Debt Activity [Line Items]      
Revolving credit facilities available $ 750    
Three Point Zero Notes Due Twenty Twenty Seven [Member] | Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.00%    
Other Debt Obligations [Member]      
Schedule of Debt Activity [Line Items]      
Repayments of Debt $ 37    
Proceeds from Issuance of Debt 1,500    
Other Corporate Bonds [Member]      
Schedule of Debt Activity [Line Items]      
Extinguishment of Debt, Amount $ 429    
Bonds [Member] | Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.00%    
Bonds [Member] | Maximum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 5.38%    
Debt with Interest Rates Ranging from 4.80% to 5.15%      
Schedule of Debt Activity [Line Items]      
Notes Reduction $ 500    
Debt with Interest Rates Ranging from 4.80% to 5.15% | Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 4.80%    
Debt with Interest Rates Ranging from 4.80% to 5.15% | Maximum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 5.15%    
Debt With Interest Rates Ranging from 4.35% to 4.40%      
Schedule of Debt Activity [Line Items]      
Notes Reduction $ 558    
Debt With Interest Rates Ranging from 4.35% to 4.40% | Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 4.35%    
Debt With Interest Rates Ranging from 4.35% to 4.40% | Maximum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 4.40%    
3.550% notes – due 2029      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.55% 3.55%  
Notes Reduction $ 200    
3.550% notes – due 2029 | Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.55%    
Three Point Eighty Percentage Notes Due Twenty Twenty Six      
Schedule of Debt Activity [Line Items]      
Notes Reduction $ 517    
Three Point Eighty Percentage Notes Due Twenty Twenty Six | Minimum [Member]      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.80%    
3.000% notes – due 2027      
Schedule of Debt Activity [Line Items]      
Debt instrument, interest rate, stated percentage 3.00% 3.00%  
Notes Reduction $ 268    
[1] Reductions related to notes with interest rates ranging from 3.00% to 9.50% with original maturities from 2021 to 2048 for the years ended December 31, 2021, 2020 and 2019.