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Restructuring of Operations - Accrued Restructuring Costs and Activity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2019
Jun. 30, 2019
Jun. 30, 2019
Restructuring Reserve [Roll Forward]      
Beginning balance $ 29 $ 26 $ 29
Charges to restructuring   9 18
Cash payments   (12) (20)
Lease cease-use reclassification (4)   (4)
Ending balance   23 23
Employee Termination Benefits [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 25 26 25
Charges to restructuring   7 15
Cash payments   (10) (17)
Ending balance   23 23
Exit Costs [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance $ 4 0 4
Charges to restructuring   2 3
Cash payments   (2) (3)
Lease cease-use reclassification     (4)
Ending balance   $ 0 $ 0