Supplemental Equity and Comprehensive Income Information - Changes in Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (decrease) in equity
Balance at the beginning of the period	$ 14,770	$ 15,117
Net income	981	1,303
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	116	(171)
Defined benefit pension and postretirement plans adjustment	51	87
Cash flow hedging instruments	(24)	(1)
Total other comprehensive income (loss), net of tax	143	(85)
Dividends declared	(827)	(852)
Stock-based compensation	125	130
Reacquired stock	(29)	(773)
Issuances pursuant to stock option and benefit plans	188	164
Balance at the end of the period	15,351	15,004
Common Stock and Additional Paid-in Capital
Increase (decrease) in equity
Balance at the beginning of the period	6,700	6,438
Other comprehensive income (loss), net of tax:
Stock-based compensation	125	130
Balance at the end of the period	6,825	6,568
Retained Earnings
Increase (decrease) in equity
Balance at the beginning of the period	47,950	45,821
Net income	976	1,299
Other comprehensive income (loss), net of tax:
Dividends declared	(827)	(852)
Issuances pursuant to stock option and benefit plans	(133)	(212)
Balance at the end of the period	47,966	46,056
Treasury Stock
Increase (decrease) in equity
Balance at the beginning of the period	(33,255)	(30,463)
Other comprehensive income (loss), net of tax:
Reacquired stock	(29)	(773)
Issuances pursuant to stock option and benefit plans	321	376
Balance at the end of the period	(32,963)	(30,860)
Accumulated Other Comprehensive Income (Loss)
Increase (decrease) in equity
Balance at the beginning of the period	(6,673)	(6,750)
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	116	(170)
Defined benefit pension and postretirement plans adjustment	51	87
Cash flow hedging instruments	(24)	(1)
Total other comprehensive income (loss), net of tax	143	(84)
Balance at the end of the period	(6,530)	(6,834)
Non- controlling Interest
Increase (decrease) in equity
Balance at the beginning of the period	48	71
Net income	5	4
Other comprehensive income (loss), net of tax:
Cumulative translation adjustment	0	(1)
Balance at the end of the period	$ 53	$ 74