Other Comprehensive Income / (Loss) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Comprehensive earnings		$ 3,134	$ 5,625	$ 1,739
Other Comprehensive Income (Loss):
Reclassification of Stranded Tax Effects		(107)
(Loss) Income Before Reclassifications		(119)	161	(13)
Amounts Reclassified to Net Earnings		32	58	51
Tax (Expense) Benefit		19	(65)	(13)
Total Other Comprehensive Loss		(175)	154	25
Pension and Other Post-Employment Benefits
Other Comprehensive Income (Loss):
Beginning Balance		(440)	(580)	(601)
Reclassification of Stranded Tax Effects		(108)
(Loss) Income Before Reclassifications		(111)	148	(16)
Amounts Reclassified to Net Earnings		38	56	50
Tax (Expense) Benefit		17	(64)	(13)
Total Other Comprehensive Loss		(164)	140	21
Ending Balance		(604)	(440)	(580)
Other
Other Comprehensive Income (Loss):
Beginning Balance		(46)	(60)	(64)
Reclassification of Stranded Tax Effects		1
(Loss) Income Before Reclassifications		(8)	13	3
Amounts Reclassified to Net Earnings		(6)	2	1
Tax (Expense) Benefit		2	(1)	0
Total Other Comprehensive Loss		(11)	14	4
Ending Balance		(57)	(46)	(60)
Accumulated Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss):
Beginning Balance		(486)	(640)	(665)
Tax (Expense) Benefit		(180)	(162)	(335)
Total Other Comprehensive Loss	[1]	(175)	154	25
Ending Balance		$ (661)	$ (486)	$ (640)

[1] Accumulated Other Comprehensive Loss year-end balances shown above are net of tax. The associated taxes were $180 million, $162 million and $335 million for 2018, 2017 and 2016, respectively. For additional information see Note 14, Other Comprehensive Income.