Equity and Accumulated Other Comprehensive Earnings - Equity activity (Details) - USD ($) shares in Thousands, $ in Millions		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 3,562	$ 3,562	$ 4,084
Net earnings		117	125
Other comprehensive earnings (loss), net of tax		125	(17)
Reclassification of stranded tax effects	79
Common dividends, net of tax benefits		(34)	(35)
Treasury stock purchases		(129)	(41)
Treasury shares reissued		5	5
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged		(3)	16
Other activity		6	1
Balance at end of the period		3,649	4,138
Common Stock
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 1,157	$ 1,157	$ 1,084
Balance (in shares)	673,237	673,237	670,576
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged		$ (3)	$ 16
Shares issued and stock compensation for stock options and other stock plans, net of shares exchanged (in shares)		1,455	1,035
Balance at end of the period		$ 1,154	$ 1,100
Balance (in shares)		674,692	671,611
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ (2,205)	$ (2,205)	$ (1,474)
Balance (in shares)	(337,979)	(337,979)	(320,695)
Treasury stock purchases		$ (129)	$ (41)
Treasury stock purchases (in shares)		(2,634)	(1,040)
Treasury shares reissued		$ 5	$ 5
Treasury shares reissued (in shares)		390	300
Other activity		$ 6	$ 2
Balance at end of the period		$ (2,323)	$ (1,508)
Balance (in shares)		(340,223)	(321,435)
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 5,341	$ 5,341	$ 5,024
Net earnings		117	125
Reclassification of stranded tax effects		79
Common dividends, net of tax benefits		(34)	(35)
Other activity		1
Balance at end of the period		5,504	5,114
Accumulated Other Comprehensive Earnings (Loss)
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	(835)	(835)	(655)
Other comprehensive earnings (loss), net of tax		125	(17)
Reclassification of stranded tax effects		(79)
Other activity			(1)
Balance at end of the period		(789)	(673)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Balance at beginning of the period	$ 104	104	105
Other activity		(1)
Balance at end of the period		$ 103	$ 105