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, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. | Postretirement Health and Life Plans      
Components of net periodic benefit cost (income)      
Service cost $ 6 $ 6 $ 7
Interest cost 36 43 47
Expected return on plan assets (6) 0 0
Amortization of net actuarial loss (gain) (27) (21) (81)
Other (3) 4 4
Net periodic benefit cost (income) $ 6 $ 32 $ (23)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 3.58% 3.99% 4.32%
Expected return on plan assets 2.00%    
U.S. | Qualified | Pension Plan      
Components of net periodic benefit cost (income)      
Service cost $ 0 $ 0 $ 0
Interest cost 563 606 634
Expected return on plan assets (1,136) (1,068) (1,038)
Amortization of net actuarial loss (gain) 147 154 139
Other 0 0 0
Net periodic benefit cost (income) $ (426) $ (308) $ (265)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 3.68% 4.16% 4.51%
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 $ 0
Interest cost 105 117 127
Expected return on plan assets (84) (95) (101)
Amortization of net actuarial loss (gain) 43 34 25
Other 0 0 3
Net periodic benefit cost (income) $ 65 $ 57 $ 54
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 3.58% 4.01% 4.34%
Expected return on plan assets 3.19% 3.50% 3.66%
Rate of compensation increase 4.00% 4.00% 4.00%
Non-U.S. | Pension Plan      
Components of net periodic benefit cost (income)      
Service cost $ 19 $ 24 $ 25
Interest cost 65 72 86
Expected return on plan assets (126) (136) (123)
Amortization of net actuarial loss (gain) 10 8 6
Other 12 (7) 2
Net periodic benefit cost (income) $ (20) $ (39) $ (4)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 2.39% 2.56% 3.59%
Expected return on plan assets 4.37% 4.73% 4.84%
Rate of compensation increase 4.31% 4.51% 4.67%