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Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 01, 2021
Oct. 02, 2020
Oct. 01, 2021
Oct. 02, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 19,976 $ 22,226 $ 20,841 $ 22,744
Other comprehensive (loss) income, before income taxes     732 (103)
Income taxes     (195) 20
Other comprehensive income (loss) recognized during the period 535 37 537 (83)
Losses (gains) reclassified to earnings     (1) (1)
Income taxes     0 2
Losses (gains) reclassified to earnings, net of income taxes (3) (3) (1) 1
Other comprehensive income (loss), net of income taxes 532 34 536 (82)
Ending balance 19,594 21,439 19,594 21,439
Foreign currency translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (58) (81)
Other comprehensive (loss) income, before income taxes     (37) (28)
Income taxes     0 0
Other comprehensive income (loss) recognized during the period     (37) (28)
Losses (gains) reclassified to earnings     1 7
Income taxes     0 0
Losses (gains) reclassified to earnings, net of income taxes     1 7
Other comprehensive income (loss), net of income taxes     (36) (21)
Ending balance (94) (102) (94) (102)
Net unrealized losses on hedging derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (80) (55)
Other comprehensive (loss) income, before income taxes     0 (75)
Income taxes     0 20
Other comprehensive income (loss) recognized during the period     0 (55)
Losses (gains) reclassified to earnings     (10) 8
Income taxes     2 (2)
Losses (gains) reclassified to earnings, net of income taxes     (8) 6
Other comprehensive income (loss), net of income taxes     (8) (49)
Ending balance (88) (104) (88) (104)
Unrecognized postretirement obligations        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (701) (372)
Other comprehensive (loss) income, before income taxes     769 0
Income taxes     (195) 0
Other comprehensive income (loss) recognized during the period     574 0
Losses (gains) reclassified to earnings     8 (16)
Income taxes     (2) 4
Losses (gains) reclassified to earnings, net of income taxes     6 (12)
Other comprehensive income (loss), net of income taxes     580 (12)
Ending balance (121) (384) (121) (384)
Total AOCI        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (835) (624) (839) (508)
Other comprehensive income (loss), net of income taxes 532 34 536 (82)
Ending balance $ (303) $ (590) $ (303) $ (590)