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Basis of Presentation and Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
Jul. 04, 2021
Dec. 31, 2020
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Decrease to retained earnings $ (96,346) $ (90,392)  
Increase to AOCI $ (4,758) $ (5,310)  
Change in Accounting Principle, Adjustment [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Decrease to retained earnings     $ 6,300
Increase to AOCI     $ 6,300