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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Restructuring Reserve [Roll Forward]  
Beginning balance $ 29
Charges to restructuring 9
Cash payments (8)
Lease cease-use reclassification (4)
Ending balance 26
Employee Termination Benefits [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 25
Charges to restructuring 7
Cash payments (6)
Ending balance 26
Exit Costs [Member]  
Restructuring Reserve [Roll Forward]  
Beginning balance 4
Charges to restructuring 2
Cash payments (2)
Lease cease-use reclassification (4)
Ending balance $ 0