Equity and Accumulated Other Comprehensive Earnings - Equity activity (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 3,019	$ 3,562
Net earnings	23	117
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale	(229)	125
Common dividends, net of tax benefits	(49)	(34)
Treasury stock purchases	(54)	(129)
Treasury shares reissued	7	5
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	(27)	(3)
Other activity	10	6
Balance at end of the period	2,700	3,649
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 1,178	$ 1,157
Balance (in shares)	676,302	673,237
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged	$ (27)	$ (3)
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged (in shares)	1,826	1,455
Balance at end of the period	$ 1,151	$ 1,154
Balance (in shares)	678,128	674,692
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ (3,122)	$ (2,205)
Balance (in shares)	351,667	337,979
Treasury stock purchases	$ (54)	$ (129)
Treasury stock purchases (in shares)	(774)	(2,634)
Treasury shares reissued	$ 7	$ 5
Treasury shares reissued (in shares)	232	390
Other activity	$ 10	$ 6
Balance at end of the period	$ (3,159)	$ (2,323)
Balance (in shares)	352,209	340,223
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 5,803	$ 5,341
Net earnings	23	117
Reclassification of stranded tax effects		79
Common dividends, net of tax benefits	(49)	(34)
Other activity		1
Balance at end of the period	5,777	5,504
Accumulated Other Comprehensive Earnings (Loss).
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	(910)	(835)
Other comprehensive earnings (loss), net of tax, excluding currency translation on assets transferred to held for sale	(229)	125
Reclassification of stranded tax effects		(79)
Balance at end of the period	(1,139)	(789)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	70	104
Other activity		(1)
Balance at end of the period	$ 70	$ 103