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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2019
Sep. 30, 2019
Sep. 30, 2019
Restructuring Reserve [Roll Forward]      
Beginning balance $ 29 $ 23 $ 29
Charges to restructuring   7 25
Adjustments of accruals   (2) (2)
Cash payments   (12) (32)
Lease cease-use reclassification 4   (4)
Ending balance   16 16
Employee Termination Benefits [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 25 23 25
Charges to restructuring   3 18
Adjustments of accruals   (2) (2)
Cash payments   (9) (26)
Ending balance   15 15
Exit Costs [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance $ 4 0 4
Charges to restructuring   4 7
Adjustments of accruals  
Cash payments   (3) (6)
Lease cease-use reclassification     (4)
Ending balance   $ 1 $ 1