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Retirement-Related Benefits - Cost of Pension Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cost/(Income) of Pension Plans    
Total defined benefit and contribution plans cost recognized in the Consolidated Statement of Earnings $ 664 $ 439
U.S.    
Cost/(Income) of Pension Plans    
Total defined benefit and contribution plans cost recognized in the Consolidated Statement of Earnings 228 91
Non-U.S.    
Cost/(Income) of Pension Plans    
Total defined benefit and contribution plans cost recognized in the Consolidated Statement of Earnings 436 348
U.S. Pension Plans    
Cost/(Income) of Pension Plans    
Cost of defined contribution plans 162 165
Non-US Pension Plans    
Cost/(Income) of Pension Plans    
Cost of defined contribution plans 101 106
U.S. Pension Plans    
Cost/(Income) of Pension Plans    
Interest cost 479 513
Expected return on plan assets (754) (922)
Amortization of prior service costs/(credits) 4 3
Recognized actuarial losses 337 333
Total net periodic pension / nonpension (income)/cost of defined benefit plans 67 (74)
Non-US Pension Plans    
Cost/(Income) of Pension Plans    
Service cost 101 104
Interest cost 201 262
Expected return on plan assets (317) (470)
Amortization of prior service costs/(credits) (24) (25)
Recognized actuarial losses 361 347
Curtailments and settlements (1) 5
Multi-employer plans/other costs 14 18
Total net periodic pension / nonpension (income)/cost of defined benefit plans $ 335 $ 241