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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Warranty [Table Text Block]
The estimate of our future warranty and field service action costs, net of estimated supplier recoveries, for the periods ended March 31 was as follows (in millions):
 
First Quarter
 
2019
 
2020
Beginning balance
$
5,137

 
$
5,702

Payments made during the period
(1,074
)
 
(1,075
)
Changes in accrual related to warranties issued during the period
693

 
805

Changes in accrual related to pre-existing warranties
271

 
521

Foreign currency translation and other
7

 
(164
)
Ending balance
$
5,034

 
$
5,789