Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Common Stock and Additional Paid-in Capital	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Treasury Stock	Total Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment	Total Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Cumulative Effect, Period of Adoption, Adjustment	Total
Balance at the beginning of the period at Dec. 31, 2017	$ 5,361		$ 39,115	$ (25,887)		$ (7,026)	$ 59		$ 11,622
Increase (decrease) in equity
Net income			5,349				14		5,363
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment						(461)	(6)		(467)
Defined benefit pension and postretirement plans adjustment						444			444
Cash flow hedging instruments - unrealized gain (loss)						176			176
Total other comprehensive income (loss), net of tax									153
Dividends declared			(3,193)						(3,193)
Transfer of ownership involving non-wholly owned subsidiaries			14			1	(15)
Stock-based compensation	291								291
Reacquired stock				(4,888)					(4,888)
Issuances pursuant to stock option and benefit plans			(649)	1,149					500
Balance at the end of the period (ASU 2018-02 Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income) at Dec. 31, 2018		$ 853			$ (853)
Balance at the end of the period (ASU 2016-02 Leases) at Dec. 31, 2018		$ 14						$ 14
Balance at the end of the period at Dec. 31, 2018	5,652		40,636	(29,626)		(6,866)	52		9,848
Increase (decrease) in equity
Net income			4,570				12		4,582
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment						212	(1)		211
Defined benefit pension and postretirement plans adjustment						(560)			(560)
Cash flow hedging instruments - unrealized gain (loss)						(72)			(72)
Total other comprehensive income (loss), net of tax									(421)
Dividends declared			(3,316)						(3,316)
Stock-based compensation	264								264
Reacquired stock				(1,381)					(1,381)
Issuances pursuant to stock option and benefit plans			(622)	1,158					536
Balance at the end of the period at Dec. 31, 2019	5,916		42,135	(29,849)		(8,139)	63		10,126
Increase (decrease) in equity
Net income			5,384				4		5,388
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment						449	(2)		447
Defined benefit pension and postretirement plans adjustment						171			171
Cash flow hedging instruments - unrealized gain (loss)						(142)			(142)
Total other comprehensive income (loss), net of tax									476
Dividends declared			(3,388)						(3,388)
Purchase of non-controlling interest							(1)		(1)
Stock-based compensation	255								255
Reacquired stock				(358)					(358)
Issuances pursuant to stock option and benefit plans			(370)	803					433
Balance at the end of the period at Dec. 31, 2020	$ 6,171		$ 43,761	$ (29,404)		$ (7,661)	$ 64		$ 12,931