Supplemental Equity and Comprehensive Income Information - SE Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Increase (decrease) in equity
Balance at the beginning of the period	$ 15,117	$ 12,931
Net income	1,303	1,627
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(171)	(222)
Defined benefit pension and postretirement plans adjustment	87	119
Cash flow hedging instruments	(1)	58
Total other comprehensive income (loss), net of tax	(85)	(45)
Dividends declared	(852)	(858)
Stock-based compensation	130	121
Reacquired stock	(773)	(243)
Issuances pursuant to stock option and benefit plans	164	295
Balance at the end of the period	15,004	13,828
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	6,438	6,171
Other comprehensive income (loss), net of tax:
Stock-based compensation	130	121
Balance at the end of the period	6,568	6,292
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	45,821	43,821
Net income	1,299	1,624
Other comprehensive income (loss), net of tax:
Dividends declared	(852)	(858)
Issuances pursuant to stock option and benefit plans	(212)	(332)
Balance at the end of the period	46,056	44,255
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(30,463)	(29,404)
Other comprehensive income (loss), net of tax:
Reacquired stock	(773)	(243)
Issuances pursuant to stock option and benefit plans	376	627
Balance at the end of the period	(30,860)	(29,020)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(6,750)	(7,721)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(170)	(223)
Defined benefit pension and postretirement plans adjustment	87	119
Cash flow hedging instruments	(1)	58
Total other comprehensive income (loss), net of tax	(84)	(46)
Balance at the end of the period	(6,834)	(7,767)
Non- controlling Interest
Increase (decrease) in equity
Balance at the beginning of the period	71	64
Net income	4	3
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	(1)	1
Balance at the end of the period	$ 74	$ 68