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Accumulated Other Comprehensive Income - Amounts Reclassified (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense $ (263) $ (259) $ (526) $ (512)
Other operating expenses (730) (606) (1,479) (1,385)
Income taxes (66) (81) (6) (174)
NET INCOME 309 312 383 632
Reclassifications from AOCI | Gains & Losses on Cash Flow Hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
NET INCOME 1 0 1 1
Reclassifications from AOCI | Gains & Losses on Cash Flow Hedges | Long-term debt        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 1 0 1 1
Reclassifications from AOCI | Net prior service costs        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses (4) (7) (27) (14)
Income taxes 1 2 6 3
NET INCOME $ (3) $ (5) $ (21) $ (11)