General (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Oct. 01, 2021	Oct. 02, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (675)	$ (1,863)	$ (368)	$ (3,068)
Increase (decrease)	(300)	604	(497)	1,841
Income tax impact	(9)	62	(24)	1
Other comprehensive income (loss) before reclassifications, net of income taxes	(309)	666	(521)	1,842
Increase (decrease)	(74)	179	(162)	218
Income tax impact	(3)	(3)	(10)	(13)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(77)	176	(172)	205
Net current period other comprehensive income (loss), net of income taxes	(386)	842	(693)	2,047
Ending balance	(1,061)	(1,021)	(1,061)	(1,021)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	232	(1,250)	745	(2,173)
Increase (decrease)	(387)	909	(885)	1,848
Income tax impact	(9)	14	(24)	(2)
Other comprehensive income (loss) before reclassifications, net of income taxes	(396)	923	(909)	1,846
Increase (decrease)	0	0	0	0
Income tax impact	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0	0	0	0
Net current period other comprehensive income (loss), net of income taxes	(396)	923	(909)	1,846
Ending balance	(164)	(327)	(164)	(327)
Pension & Postretirement Plan Benefit Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(907)	(765)	(928)	(781)
Increase (decrease)	0	0	0	0
Income tax impact	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of income taxes	0	0	0	0
Increase (decrease)	15	12	43	34
Income tax impact	(3)	(3)	(10)	(9)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	12	9	33	25
Net current period other comprehensive income (loss), net of income taxes	12	9	33	25
Ending balance	(895)	(756)	(895)	(756)
Unrealized Gain (Loss) on Available-For-Sale Securities Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1)	0	0	(1)
Increase (decrease)	0	0	(1)	1
Income tax impact	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of income taxes	0	0	(1)	1
Increase (decrease)	0	0	0	0
Income tax impact	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0	0	0	0
Net current period other comprehensive income (loss), net of income taxes	0	0	(1)	1
Ending balance	(1)	0	(1)	0
Cash Flow Hedge Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	1	152	(185)	(113)
Increase (decrease)	87	(305)	389	(8)
Income tax impact	0	48	0	3
Other comprehensive income (loss) before reclassifications, net of income taxes	87	(257)	389	(5)
Increase (decrease)	(89)	167	(205)	184
Income tax impact	0	0	0	(4)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(89)	167	(205)	180
Net current period other comprehensive income (loss), net of income taxes	(2)	(90)	184	175
Ending balance	$ (1)	$ 62	$ (1)	$ 62