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Retirement-Related Benefits - Cost of Pension Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cost/(Income) of Pension Plans    
Total defined benefit and contribution plans cost recognized in the Consolidated Statement of Earnings $ 738 $ 664
U.S.    
Cost/(Income) of Pension Plans    
Total defined benefit and contribution plans cost recognized in the Consolidated Statement of Earnings 303 228
U.S. | Pension Plans    
Cost/(Income) of Pension Plans    
Interest cost 430 479
Expected return on plan assets (676) (754)
Amortization of prior service costs/(credits) 4 4
Recognized actuarial losses 384 337
Total net periodic pension / nonpension (income)/cost of defined benefit plans 143 67
Cost of defined contribution plans 160 162
Non-U.S.    
Cost/(Income) of Pension Plans    
Total defined benefit and contribution plans cost recognized in the Consolidated Statement of Earnings 434 436
Non-U.S. | Pension Plans    
Cost/(Income) of Pension Plans    
Service cost 104 101
Interest cost 215 201
Expected return on plan assets (348) (317)
Amortization of prior service costs/(credits) (21) (24)
Recognized actuarial losses 359 361
Curtailments and settlements 0 (1)
Multi-employer plans 10 9
Other costs 7 5
Total net periodic pension / nonpension (income)/cost of defined benefit plans 327 335
Cost of defined contribution plans $ 108 $ 101