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Leases (Tables)
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Lessee, Operating Lease, Disclosure [Table Text Block]
Future minimum rental commitments as of December 31, 2018 under all noncancellable lease agreements, including capital leases, were as follows:
(in millions)
 
2019
$
73

2020
61

2021
47

2022
39

2023
31

Thereafter
111

 
$
362



Future minimum purchase obligations as of December 31, 2018, were as follows:
(in millions)
 
2019
$
362

2020
23

2021
12

2022
3

2023
2

Thereafter
7

 
$
409