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Debt and Lines of Credit (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 24, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt and Lines of Credit        
Proceeds from issuance of debt       $ 4,011
Net loss on extinguishment of debt   $ 67   $ 81
2.80% Notes, due 2020        
Debt and Lines of Credit        
Repayments of debt $ 500      
Interest rate percentage 2.80%      
September 2019 board of director's debt authorization        
Debt and Lines of Credit        
Long-term notes authorized for redemption     $ 5,000  
Board of directors' prior debt redemption authorization        
Debt and Lines of Credit        
Bond not yet redeemed under previous authorization by the board of directors     $ 700