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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Millions
Sep. 30, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Materials and supplies, allowance for obsolescence | $ $ 159 $ 148
Shares, authorized 393,397,220 396,260,487
Shares, conditionally authorized 167,617,649 167,617,649
Shares, issued 370,967,382 373,830,649
Shares, outstanding 365,461,629 364,035,397
Treasury shares   2,863,267
Maximum    
Allowance for doubtful accounts | $ $ 1 $ 1