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Leases - Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Leases - Consolidated Balance Sheet [Abstract] |  |  |
Prepaid expenses | $ 98 | $ 90 | $ 103
Operating lease right-of-use assets | 970 | 975 | 0
Other assets and deferred charges | 579 | 604 | 616
Short-term operating lease liabilities | 115 | 112 | 0
Other current liabilities | 90 | 106 | 114
Long-term operating lease liabilities | 931 | 949 | 0
Other deferred liabilities and credits | $ 475 | 438 | $ 541
ASC 842 Adjustment |  |  |
Leases - Consolidated Balance Sheet [Abstract] |  |  |
Prepaid expenses |  | (13) |
Operating lease right-of-use assets |  | 975 |
Other assets and deferred charges |  | (12) |
Short-term operating lease liabilities |  | 112 |
Other current liabilities |  | (8) |
Long-term operating lease liabilities |  | 949 |
Other deferred liabilities and credits |  | $ (103) |

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