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Special Charges and Mark-to-Market ("MTM") Adjustments - Components of Special Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Income and Expenses [Abstract]        
Severance and benefit costs $ 2 $ 9 $ 14 $ 34
Impairment of assets 0 11 69 145
(Gains) losses on sale of assets and other special charges 25 (3) 33 7
Total operating special charges 27 17 [1] 116 186 [1]
Nonoperating MTM (gains) losses on financial instruments (21) (29) (72) 61
Total special charges and MTM (gains) losses on financial instruments 6 (12) 44 247
Income tax expense (benefit) (2) 3 (10) (55)
Total special charges and MTM (gains) losses on financial instruments, net of income tax $ 4 $ (9) $ 34 $ 192
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.