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Litigation, Environmental and Other Contingencies Other Contingencies (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Other contingencies    
Accrual for Environmental Loss Contingencies $ 270 $ 271
Recorded Third-Party Environmental Recoveries Receivable 13 $ 13
Indirect Guarantee of Indebtedness [Member] | Equity Method Investee [Member]    
Other contingencies    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 700  
Indirect Guarantee of Indebtedness [Member] | Guarantee of Indebtedness of Others [Member]    
Other contingencies    
Maximum payment under agreement $ 350