Annual report pursuant to Section 13 and 15(d)

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

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Employee Benefit Plans - Components of Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Qualified Pension Plan      
Components of net periodic benefit cost (income)      
Service cost $ 0 $ 0 $ 0
Interest cost 634 621 665
Expected return on plan assets (1,038) (1,045) (1,018)
Amortization of prior service cost 0 0 0
Amortization of net actuarial loss (gain) 139 170 111
Recognized loss due to settlements and curtailments 0 0 0
Net periodic benefit cost (income) $ (265) $ (254) $ (242)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 4.51% 4.12% 4.85%
Expected return on plan assets 6.00% 6.00% 6.00%
Non-U.S. Pension Plans      
Components of net periodic benefit cost (income)      
Service cost $ 25 $ 27 $ 29
Interest cost 86 93 109
Expected return on plan assets (123) (133) (137)
Amortization of prior service cost 1 1 1
Amortization of net actuarial loss (gain) 6 6 3
Recognized loss due to settlements and curtailments 1 0 2
Net periodic benefit cost (income) $ (4) $ (6) $ 7
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 3.59% 3.56% 4.30%
Expected return on plan assets 4.84% 5.27% 5.52%
Rate of compensation increase 4.67% 4.70% 4.91%
Nonqualified and Other Pension Plans      
Components of net periodic benefit cost (income)      
Service cost $ 0 $ 0 $ 1
Interest cost 127 122 133
Expected return on plan assets (101) (92) (124)
Amortization of prior service cost 0 0 0
Amortization of net actuarial loss (gain) 25 34 25
Recognized loss due to settlements and curtailments 3 0 0
Net periodic benefit cost (income) $ 54 $ 64 $ 35
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 4.34% 3.80% 4.55%
Expected return on plan assets 3.66% 3.26% 4.60%
Rate of compensation increase 4.00% 4.00% 4.00%
Postretirement Health and Life Plans      
Components of net periodic benefit cost (income)      
Service cost $ 7 $ 8 $ 8
Interest cost 47 48 58
Expected return on plan assets 0 (1) (4)
Amortization of prior service cost 4 4 4
Amortization of net actuarial loss (gain) (81) (46) (89)
Recognized loss due to settlements and curtailments 0 0 0
Net periodic benefit cost (income) $ (23) $ 13 $ (23)
Weighted-average assumptions used to determine net cost for years ended December 31      
Discount rate 4.32% 3.75% 4.50%
Expected return on plan assets   6.00% 6.00%