Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details)

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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.S. | Postretirement Health and Life Plans      
Components of net periodic benefit cost (income)      
Service cost $ 5 $ 6 $ 6
Interest cost 38 36 43
Expected return on plan assets (5) (6) 0
Amortization of net actuarial loss (gain) (24) (27) (21)
Other (2) (3) 4
Net periodic benefit cost (income) $ 12 $ 6 $ 32
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 4.25% 3.58% 3.99%
Expected return on plan assets 2.00% 2.00%  
U.S. | Qualified | Pension Plan      
Components of net periodic benefit cost (income)      
Service cost $ 0 $ 0 $ 0
Interest cost 593 563 606
Expected return on plan assets (1,088) (1,136) (1,068)
Amortization of net actuarial loss (gain) 135 147 154
Other 0 0 0
Net periodic benefit cost (income) $ (360) $ (426) $ (308)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 4.32% 3.68% 4.16%
Expected return on plan assets 6.00% 6.00% 6.00%
U.S. | Nonqualified | Other Pension Plan      
Components of net periodic benefit cost (income)      
Service cost $ 1 $ 1 $ 1
Interest cost 113 105 117
Expected return on plan assets (95) (84) (95)
Amortization of net actuarial loss (gain) 34 43 34
Other 0 0 0
Net periodic benefit cost (income) $ 53 $ 65 $ 57
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 4.26% 3.58% 4.01%
Expected return on plan assets 3.73% 3.19% 3.50%
Rate of compensation increase 4.00% 4.00% 4.00%
Non-U.S. | Pension Plan      
Components of net periodic benefit cost (income)      
Service cost $ 17 $ 19 $ 24
Interest cost 65 65 72
Expected return on plan assets (99) (126) (136)
Amortization of net actuarial loss (gain) 6 10 8
Other 4 12 (7)
Net periodic benefit cost (income) $ (7) $ (20) $ (39)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 2.60% 2.39% 2.56%
Expected return on plan assets 4.13% 4.37% 4.73%
Rate of compensation increase 4.49% 4.31% 4.51%