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Pre-Tax (Charges) / Gains in Earnings from Continuing Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Line Items]                      
Asset impairment and exit costs $ (120) $ (183) $ (187) $ (166) $ (342) $ (190) $ (166) $ (154) $ 656 $ 852 $ 901
Net gain on divestitures 2 187 (3) 0         (186) (9) (6,822)
Divestiture-related costs (8) 2 (9) (19) (2) 0 (84) 0      
Loss related to interest rate swaps         0 0 0 (97) 0 0 (436)
Loss on early extinguishment of debt and related expenses 0 0 (11) 0 (427) 0 0 0 $ (11) $ (427) $ (753)
Benefits from the resolution of tax matters 8 215 0 58              
Pre-tax charges / (gains) in earnings from continuing operations $ (118) $ 221 $ (210) $ (127) $ (771) $ (190) $ (250) $ (251)