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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 1,122	$ 227
Additions, interest accretion and other	46	455
Payments	(317)	(37)
Revisions to estimates and effect of foreign currency	(21)	(12)
Balance at end of period	830	633
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Payments	(315)
Pre-tax restructuring charges	790
Cost since inception	$ 2,100
GMI [Member] | Korea [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		900
GMI [Member] | Korea [Member] | Non-cash Asset Impairments [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		464
GMI [Member] | Korea [Member] | Employee Separation Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		$ 436
Forecast [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows			$ 1,500
Forecast [Member] | Minimum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected costs				$ 900
Forecast [Member] | Maximum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected costs				$ 1,500

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost including foreign currency translation adjustments, excluding adjustments for costs incurred during the period and costs settled during the period.

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Amount expected to be recognized in earnings for the specified restructuring cost.

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