Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings	$ 42,135				$ 40,636				$ 42,135	$ 40,636
Contract Balance
Software license contracts term									1 year	1 year
Net Sales	$ 8,111	$ 7,991	$ 8,171	$ 7,863	$ 7,945	$ 8,152	$ 8,390	$ 8,278	$ 32,136	$ 32,765
Difference between Revenue Guidance in Effect before and after Topic 606 | Maximum
Revenue, Initial Application Period Cumulative Effect Transition
Retained earnings											$ 2
ASU 2014-09 Revenue from Contracts with Customers | Difference between Revenue Guidance in Effect before and after Topic 606
Contract Balance
Deferred income recognized as revenue									$ 600	$ 500