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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period $ 2,404 $ (85) $ 571
Amortization of actuarial loss (519) (792) (817)
Prior service (credits) costs during period 28 26 1
Amortization of prior service (costs) credits (4) 13 20
Other Benefits      
Net Periodic Benefit Cost      
Service cost 36 42 32
Interest cost 96 94 95
Expected return on plan assets 0 0 0
Amortization of prior service costs (credits) (28) (28) (28)
Recognized actuarial losses (3) 15 (5)
Settlement losses 0 0 0
Curtailment losses (gains) 0 0 0
Total net periodic benefit cost 101 123 94
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period 128 (248) 284
Amortization of actuarial loss 3 (15) 5
Prior service (credits) costs during period (1) 3 0
Amortization of prior service (costs) credits 28 28 28
Total changes recognized in other comprehensive income 158 (232) 317
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 259 (109) 411
U.S. | Pension Benefits      
Net Periodic Benefit Cost      
Service cost 406 480 489
Interest cost 397 370 366
Expected return on plan assets (565) (636) (597)
Amortization of prior service costs (credits) 2 2 (5)
Recognized actuarial losses 239 304 340
Settlement losses 259 411 436
Curtailment losses (gains) 0 0 0
Total net periodic benefit cost 738 931 1,029
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period 1,939 151 381
Amortization of actuarial loss (498) (715) (776)
Prior service (credits) costs during period 0 0 0
Amortization of prior service (costs) credits (2) (2) 5
Total changes recognized in other comprehensive income 1,439 (566) (390)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 2,177 365 639
Int’l. | Pension Benefits      
Net Periodic Benefit Cost      
Service cost 139 141 151
Interest cost 199 206 219
Expected return on plan assets (231) (253) (239)
Amortization of prior service costs (credits) 11 10 13
Recognized actuarial losses 21 29 44
Settlement losses 3 33 2
Curtailment losses (gains) 16 3 0
Total net periodic benefit cost 158 169 190
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period 338 12 (94)
Amortization of actuarial loss (24) (62) (46)
Prior service (credits) costs during period 29 23 1
Amortization of prior service (costs) credits (30) (13) (13)
Total changes recognized in other comprehensive income 313 (40) (152)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income $ 471 $ 129 $ 38