Restructuring Program - Restructuring Liability Activity (Details) - Simplify to Grow Program - USD ($) $ in Millions	3 Months Ended	12 Months Ended				68 Months Ended
	Mar. 31, 2019	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Liability balance, January 1	$ 373	$ 373		$ 464
Charges		176	[1]	316	$ 535	$ 2,726	[2]
Cash spent		(162)		(310)
Non-cash settlements/adjustments		(82)	[3]	(67)
Currency		(4)		(30)
Liability balance, December 31		301		373	464	301
ASU 2016-02
Restructuring Cost and Reserve [Line Items]
Non-cash settlements/adjustments	23
Pension Plans
Restructuring Cost and Reserve [Line Items]
Settlement losses recorded within benefit plan non-service income		5		5
Severance and related costs
Restructuring Cost and Reserve [Line Items]
Liability balance, January 1	373	373		464
Charges		125	[1]	253
Cash spent		(162)		(310)
Non-cash settlements/adjustments		(31)	[3]	(4)
Currency		(4)		(30)
Liability balance, December 31		301		373	464	301
Asset Write-downs
Restructuring Cost and Reserve [Line Items]
Liability balance, January 1	$ 0	0		0
Charges		51	[1]	63
Cash spent		0		0
Non-cash settlements/adjustments		(51)	[3]	(63)
Currency		0		0
Liability balance, December 31		$ 0		$ 0	$ 0	$ 0

[1] During 2017-2019, our North America region implementation costs included incremental costs that we incurred related to renegotiating collective bargaining agreements that expired in February 2016 for eight U.S. facilities and related to executing business continuity plans for the North America business.

[2] Includes all charges recorded since program inception on May 6, 2014 through December 31, 2019.

[3] We adopted the new lease accounting ASU as of January 1, 2019. The ASU requires recording onerous lease liabilities netted with right of use assets. Therefore, during the first quarter of 2019, we reclassified onerous lease liabilities that totaled $23 million as of March 31, 2019, from accrued liabilities and other accrued liabilities to operating lease right of use assets.