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Quarterly Financial Data (Unaudited) - Pre-Tax (Charges)/Gains in Earnings from Continuing Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Asset impairment and exit costs $ (99) $ (125) $ (111) $ (54) $ (118) $ (182) $ (176) $ (166) $ (389) $ (642) $ (837)
Divestiture-related costs (2) 0 0 3 (8) 2 (9) (19)      
Gain on equity method investment transactions 21 757 0 0 40 0 0 0 778 40 43
Net gain on divestitures         2 187 (3) 0 0 186 9
Gain/(loss) related to interest rate swaps 0 1 (5) 14              
Loss on early extinguishment of debt and related expenses 0 0 (140) 0 0 0 (11) 0 $ (140) $ (11) $ (427)
Impact from the resolution of tax matters 26 0 (15) 0 8 215 0 58      
Impact from pension participation changes (17) (3) (409) 0              
Pre-tax charges/(gains) in earnings from continuing operations $ (71) $ 630 $ (680) $ (37) $ (116) $ 222 $ (199) $ (127)