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Leases - Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases - Consolidated Balance Sheet [Abstract]      
Prepaid expenses $ 95 $ 90 $ 103
Operating lease right-of-use assets 963 975 0
Other assets and deferred charges 568 604 616
Short-term operating lease liabilities 112 112 0
Other current liabilities 85 106 114
Long-term operating lease liabilities 927 949 0
Other deferred liabilities and credits $ 450 438 $ 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)