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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)

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