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Notes Payable, Long-Term Debt and Available Credit Facilities (Short Term Borrowings and Capital Lease Obligations) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Successor    
Short-term Debt [Line Items]    
Long-term Debt, Current Maturities $ 1,328  
Debt, Current 5,920  
Predecessor    
Short-term Debt [Line Items]    
Long-term Debt, Current Maturities   $ 4
Debt, Current   429
Commercial Paper [Member] | Successor    
Short-term Debt [Line Items]    
Short-term Debt 3,244  
Commercial Paper [Member] | Predecessor    
Short-term Debt [Line Items]    
Short-term Debt   386
Notes Payable to Banks [Member] | Successor    
Short-term Debt [Line Items]    
Short-term Debt 48  
Notes Payable to Banks [Member] | Predecessor    
Short-term Debt [Line Items]    
Short-term Debt   39
Securities Sold under Agreements to Repurchase [Member] | Repurchase Facility [Member] | Successor    
Short-term Debt [Line Items]    
Short-term Debt $ 1,300  
Securities Sold under Agreements to Repurchase [Member] | Repurchase Facility [Member] | Predecessor    
Short-term Debt [Line Items]    
Short-term Debt   $ 0