Equity and Comprehensive Earnings - Equity activity (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 3,337	$ 3,019
Net earnings	200	23
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale	57	(229)
Common dividends, net of tax benefits	(50)	(49)
Treasury stock purchases	(10)	(54)
Treasury shares reissued	8	7
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	12	(27)
Other activity		10
Balance at end of the period	3,554	2,700
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 1,167	$ 1,178
Balance (in shares)	679,524	676,302
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	$ 4	$ (27)
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged (in shares)	490	1,826
Balance at end of the period	$ 1,171	$ 1,151
Balance (in shares)	680,014	678,128
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ (3,130)	$ (3,122)
Balance (in shares)	351,939	351,667
Treasury stock purchases	$ (10)	$ (54)
Treasury stock purchases (in shares)	(121)	(774)
Treasury shares reissued	$ 8	$ 7
Treasury shares reissued (in shares)	161	232
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	$ 8
Other activity		$ 10
Balance at end of the period	$ (3,124)	$ (3,159)
Balance (in shares)	351,899	352,209
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 6,192	$ 5,803
Net earnings	200	23
Common dividends, net of tax benefits	(50)	(49)
Balance at end of the period	6,342	5,777
Accumulated Other Comprehensive Earnings (Loss).
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	(954)	(910)
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale	57	(229)
Balance at end of the period	(897)	(1,139)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	62	70
Balance at end of the period	$ 62	$ 70