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Debt - Components (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Jul. 27, 2021
Dec. 31, 2020
Financing Arrangements            
Long-term debt   $ 1,748 $ 1,748     $ 1,748
Average amount of commercial paper outstanding   401        
Commercial paper   350 350      
Other short-term borrowings   48 48     58
Total short-term borrowings   398 398     438
Total debt   $ 2,146 2,146     $ 2,186
Payments on debt     1,194 $ 1,186    
Proceeds from Borrowings     $ 804 $ 1,527    
2.9% senior notes due June 1, 2030            
Financing Arrangements            
Debt, interest rate (as a percent)   2.90% 2.90%     2.90%
Long-term debt   $ 594 $ 594     $ 594
3.2% senior notes due October 1, 2026            
Financing Arrangements            
Debt, interest rate (as a percent)   3.20% 3.20%     3.20%
Long-term debt   $ 498 $ 498     $ 497
3.9% senior notes due June 1, 2050            
Financing Arrangements            
Debt, interest rate (as a percent)   3.90% 3.90%     3.90%
Long-term debt   $ 390 $ 390     $ 390
6.625% senior notes due April 15, 2037            
Financing Arrangements            
Debt, interest rate (as a percent)   6.625% 6.625%     6.625%
Long-term debt   $ 253 $ 253     $ 253
Revolving credit agreement            
Financing Arrangements            
Debt instrument term 5 years          
Maximum aggregate principal amount $ 1,000          
Maximum leverage ratio 3.5          
Minimum ratio of consolidated EBIDTA to consolidated net interest expense 3.5          
Revolving credit agreement | London Interbank Offered Rate (LIBOR) [Member]            
Financing Arrangements            
Basis spread 1.00%          
Other long-term borrowings            
Financing Arrangements            
Long-term debt   $ 13 13     14
Term loan credit agreement due April 12, 2021            
Financing Arrangements            
Long-term debt, current           $ 380
Payments on debt     $ 380      
Applicable interest rate (as a percent)           0.80%
Amended term loan credit agreement due March 15, 2022            
Financing Arrangements            
Applicable interest rate (as a percent)   0.75% 0.75%      
Commercial paper            
Financing Arrangements            
Maximum aggregate principal amount         $ 1,000  
Weighted average interest rate (as a percent)     0.28%      
Weighted average maturity     76 days