Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated other comprehensive income (loss)
Beginning Balance	$ 27,153	$ 21,523	$ 27,169	$ 27,153
Other Comprehensive Income (Loss), Net of Income Taxes		344	(6)	(7)
Income taxes reclassified to retained earnings	(89)		5
Ending Balance		21,637	21,523	27,169
Defined Benefit Plans
Accumulated other comprehensive income (loss)
Beginning Balance	(472)	(809)	(656)	(472)
Other comprehensive income (loss) before reclassifications		318	(262)	(140)
Amounts reclassified from accumulated other comprehensive loss		93	109	49
Other Comprehensive Income (Loss), Net of Income Taxes		411	(153)	(91)
Income taxes reclassified to retained earnings	(93)		0
Ending Balance		(398)	(809)	(656)
Foreign Currency Translation
Accumulated other comprehensive income (loss)
Beginning Balance	(228)	25	(131)	(228)
Other comprehensive income (loss) before reclassifications		(70)	151	95
Amounts reclassified from accumulated other comprehensive loss		0	0	0
Other Comprehensive Income (Loss), Net of Income Taxes		(70)	151	95
Income taxes reclassified to retained earnings	2		5
Ending Balance		(45)	25	(131)
Hedging
Accumulated other comprehensive income (loss)
Beginning Balance	8	(5)	(1)	8
Other comprehensive income (loss) before reclassifications		2	1	(5)
Amounts reclassified from accumulated other comprehensive loss		1	(5)	(6)
Other Comprehensive Income (Loss), Net of Income Taxes		3	(4)	(11)
Income taxes reclassified to retained earnings	2		0
Ending Balance		(2)	(5)	(1)
Accumulated Other Comprehensive Loss
Accumulated other comprehensive income (loss)
Beginning Balance	$ (692)	(789)	(788)	(692)
Other comprehensive income (loss) before reclassifications		250	(110)	(50)
Other Comprehensive Income (Loss), Net of Income Taxes		344	(6)	(7)
Ending Balance		$ (445)	$ (789)	$ (788)