Supplemental Equity and Comprehensive Income Information - Reclass AOCI (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount Reclassified from Accumulated Other Comprehensive Income
Deconsolidation of Venezuelan subsidiary			$ 162
Net of tax		$ (461)	(438)	$ (538)
Venezuela
Amount Reclassified from Accumulated Other Comprehensive Income
Deconsolidation of Venezuelan subsidiary	$ 162
Cumulative Translation Adjustment
Amount Reclassified from Accumulated Other Comprehensive Income
Deconsolidation of Venezuelan subsidiary			(142)
Total before tax			(142)
Net of tax			(142)
Defined Pension and Postretirement Plans Adjustment
Amount Reclassified from Accumulated Other Comprehensive Income
Deconsolidation of Venezuelan subsidiary			(2)
Transition asset		(2)
Prior service benefit		62	69	76
Net actuarial loss		(716)	(478)	(678)
Curtailments/Settlements		(20)	(48)	(4)
Total before tax		(676)	(459)	(606)
Tax effect		161	110	145
Net of tax		(515)	(349)	(461)
Cash Flow Hedging Instruments, Unrealized Gain (Loss)
Amount Reclassified from Accumulated Other Comprehensive Income
Total before tax		71	70
Tax effect		(17)	(17)
Net of tax		54	53
Cash Flow Hedging Instruments, Unrealized Gain (Loss) | Foreign currency exchange contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Cost of sales		80	74
Cash Flow Hedging Instruments, Unrealized Gain (Loss) | Interest rate contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense		$ (9)	$ (4)
Cash Flow Hedging Instruments, Unrealized Gain (Loss)
Amount Reclassified from Accumulated Other Comprehensive Income
Total before tax				(96)
Tax effect				19
Net of tax				(77)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) | Foreign currency exchange contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Cost of sales				(95)
Cash Flow Hedging Instruments, Unrealized Gain (Loss) | Interest rate contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Interest expense				$ (1)