Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Level 3 Fair Value Measurements (Details)

v3.24.0.1
Employee Benefit Plans - Level 3 Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in fair value of plan assets      
Fair value, January 1 $ 19,123    
Fair value, December 31 19,655 $ 19,123  
U.S. government and agency securities      
Change in fair value of plan assets      
Fair value, January 1 4,022    
Fair value, December 31 4,425 4,022  
Participant loans      
Change in fair value of plan assets      
Fair value, January 1 6    
Fair value, December 31 6 6  
Other investments      
Change in fair value of plan assets      
Fair value, January 1 434    
Fair value, December 31 475 434  
Level 3      
Change in fair value of plan assets      
Fair value, January 1 421 643 $ 698
Actual Return on Plan Assets Still Held at the Reporting Date 4 (8) (5)
Purchases, Sales and Settlements 12 (214) (50)
Fair value, December 31 437 421 643
Level 3 | U.S. government and agency securities      
Change in fair value of plan assets      
Fair value, January 1 5 6 7
Actual Return on Plan Assets Still Held at the Reporting Date 0 0 0
Purchases, Sales and Settlements (1) (1) (1)
Fair value, December 31 4 5 6
Level 3 | Participant loans      
Change in fair value of plan assets      
Fair value, January 1 6 7 7
Actual Return on Plan Assets Still Held at the Reporting Date 0 0 0
Purchases, Sales and Settlements 0 (1) 0
Fair value, December 31 6 6 7
Level 3 | Other investments      
Change in fair value of plan assets      
Fair value, January 1 410 630 684
Actual Return on Plan Assets Still Held at the Reporting Date 4 (8) (5)
Purchases, Sales and Settlements 13 (212) (49)
Fair value, December 31 $ 427 $ 410 $ 630