Supplemental Equity and Comprehensive Income Information - SE Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (decrease) in equity
Balance at the beginning of the period	$ 14,516	$ 10,925	$ 12,931	$ 10,126
Net income	1,437	1,434	4,589	4,047
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(302)	271	(354)	(67)
Defined benefit pension and postretirement plans adjustment	119	116	359	271
Cash flow hedging instruments	48	(71)	95	(60)
Total other comprehensive income (loss), net of tax	(135)	316	100	144
Dividends declared	(856)	(847)	(2,572)	(2,540)
Purchase of subsidiary shares				(1)
Stock-based compensation	46	42	221	209
Reacquired stock	(563)	(1)	(1,305)	(357)
Issuances pursuant to stock option and benefit plans	85	90	566	331
Balance at the end of the period	14,530	11,959	14,530	11,959
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	6,346	6,083	6,171	5,916
Other comprehensive income (loss), net of tax:
Stock-based compensation	46	42	221	209
Balance at the end of the period	6,392	6,125	6,392	6,125
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	44,824	42,786	43,821	42,130
Net income	1,434	1,430	4,582	4,044
Other comprehensive income (loss), net of tax:
Dividends declared	(856)	(847)	(2,572)	(2,540)
Issuances pursuant to stock option and benefit plans	(41)	(40)	(470)	(305)
Balance at the end of the period	45,361	43,329	45,361	43,329
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(29,236)	(29,699)	(29,404)	(29,849)
Other comprehensive income (loss), net of tax:
Reacquired stock	(563)	(1)	(1,305)	(357)
Issuances pursuant to stock option and benefit plans	126	130	1,036	636
Balance at the end of the period	(29,673)	(29,570)	(29,673)	(29,570)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(7,486)	(8,303)	(7,721)	(8,134)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(301)	270	(353)	(65)
Defined benefit pension and postretirement plans adjustment	119	116	359	271
Cash flow hedging instruments	48	(71)	95	(60)
Total other comprehensive income (loss), net of tax	(134)	315	101	146
Balance at the end of the period	(7,620)	(7,988)	(7,620)	(7,988)
Non- controlling Interest
Increase (decrease) in equity
Balance at the beginning of the period	68	58	64	63
Net income	3	4	7	3
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(1)	1	(1)	(2)
Purchase of subsidiary shares				(1)
Balance at the end of the period	$ 70	$ 63	$ 70	$ 63