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Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ (6,000)  
Other comprehensive income $ 102 $ (505) 75 $ (363)
Ending balance (5,925)   (5,925)  
Defined Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (448)  
Other comprehensive income     17  
Ending balance (431)   (431)  
Net Unrealized Loss on Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (11)  
Other comprehensive income     1  
Ending balance (10)   (10)  
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     (5,541)  
Other comprehensive income     57  
Ending balance $ (5,484)   $ (5,484)