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Assets/Liabilities Held for Sale and Divestitures - Assets and Liabilities Reclassified to Held for Sale (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Accounts receivable, net $ 782 $ 908 $ 1,114
Total Assets held for sale 15   757
Accounts payable 230   118
Unearned income 112   $ 151
Held-for-sale      
Accounts receivable, net 15    
Total Assets held for sale 15    
Accounts payable 1    
Accrued compensation 16    
Unearned income 8    
Other 15    
Total Liabilities held for sale $ 40