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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      
Prepaid expenses $ 49 $ 50 $ 63
Operating lease right-of-use assets 897 899 0
Other assets and deferred charges 539 567 579
Short-term operating lease liabilities 104 101 0
Other current liabilities 78 86 94
Long-term operating lease liabilities 864 878 0
Other deferred liabilities and credits $ 312 292 $ 389
ASC 842 Adjustment      
Leases - Consolidated Balance Sheet      
Prepaid expenses   (13)  
Operating lease right-of-use assets   899  
Other assets and deferred charges   (12)  
Short-term operating lease liabilities   101  
Other current liabilities   (8)  
Long-term operating lease liabilities   878  
Other deferred liabilities and credits   $ (97)