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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Asset impairment and exit costs $ (48) $ (123) $ (115) $ (15) $ (59) $ (134) $ (15) $ (20) $ (301) $ (228) $ (389)
Net gain on divestiture         0 3 41 0 0 44 0
Impact from pension participation changes (2) (3) (3) (3) (3) (3) 35 0      
Impact from the resolution of tax matters 48 0 0 0 (85) 0 0 0      
Loss related to interest rate swaps 0 0 0 (103) 0 (111) 0 0      
Loss on debt extinguishment (185) 0 0 0         (185) 0 (140)
Gain/(loss) on equity method investment transactions 452 345 121 71 0 0 (25) 23 $ 989 $ (2) $ 778
Pre-tax charges/(gains) in earnings from continuing operations $ 265 $ 219 $ 3 $ (50) $ (147) $ (245) $ 36 $ 3