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Equity Activity - Reclassifications and Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost $ 42,655 $ 42,196 [1] $ 41,403 [1]
SG&A expense 19,366 19,680 [1] 20,869 [1]
Other (income) and expense 1,152 1,125 [1] 593 [1]
Interest expense 723 615 630
Provision for/(benefit from) income taxes 2,619 5,642 449
Net (income) loss (8,728) (5,753) (11,872)
Other comprehensive income/(loss) (476) 2,806 209
Services      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 34,059 33,811 [1] 33,792 [1]
Sales      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 7,464 7,175 [1] 6,566 [1]
Financing      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 1,132 1,210 1,044
Accumulated Other Comprehensive Income/(Loss)      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Net of Tax Amount (3,089) 1,206 (1,581)
Reclassification/amortization, Net of Tax Amount 2,612 1,599 1,791
Other comprehensive income/(loss), Before Tax Amount (215) 3,235 472
Other comprehensive income/(loss), Tax (Expense)/Benefit (262) (429) (263)
Other comprehensive income/(loss) (476) 2,806 209
Foreign Currency Translation Adjustments      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Net of Tax Amount (902) 769 (140)
Reclassification/amortization, Net of Tax Amount   0 0
Other comprehensive income/(loss), Before Tax Amount (730) 152 (20)
Other comprehensive income/(loss), Tax (Expense)/Benefit (172) 617 (120)
Other comprehensive income/(loss) (902) 769 (140)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Before Tax Amount (2) 1 (38)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 1 (1) 14
Unrealized gains/(losses) arising during the period, Net of Tax Amount (1) 0 (23)
Reclassification/amortization, Net of Tax Amount   1 21
Other comprehensive income/(loss), Before Tax Amount (2) 2 (3)
Other comprehensive income/(loss), Tax (Expense)/Benefit 1 (1) 1
Other comprehensive income/(loss) (1) 1 (2)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities | Reclassifications      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Other (income) and expense   1 34
Provision for/(benefit from) income taxes   0 (13)
Net (income) loss   1 21
Net Unrealized Gains/(Losses) on Cash Flow Hedges      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Before Tax Amount (136) (58) 243
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 43 0 (80)
Unrealized gains/(losses) arising during the period, Net of Tax Amount (93) (58) 163
Reclassification/amortization, Net of Tax Amount 337 (226) 56
Other comprehensive income/(loss), Before Tax Amount 313 (421) 345
Other comprehensive income/(loss), Tax (Expense)/Benefit (69) 137 (126)
Other comprehensive income/(loss) 244 (284) 219
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
SG&A expense 0 (11) (4)
Other (income) and expense 341 (324) 68
Interest expense 71 22 13
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Services      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost (30) (70) 8
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Sales      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost (8) (3) 5
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Financing      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 75 23 12
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of services      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Provision for/(benefit from) income taxes 8 27 (3)
Net (income) loss (22) (43) 5
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of sales      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Provision for/(benefit from) income taxes 3 1 (5)
Net (income) loss (5) (3) 1
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of financing      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Provision for/(benefit from) income taxes (19) (9) (4)
Net (income) loss 56 14 7
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | SG&A expense      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Provision for/(benefit from) income taxes 0 3 (2)
Net (income) loss 0 (9) (7)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Other (income) and expense      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Provision for/(benefit from) income taxes (86) 124 (26)
Net (income) loss 255 (199) 42
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Interest expense      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Provision for/(benefit from) income taxes (18) (8) (5)
Net (income) loss 53 13 8
Net Change Retirement-Related Benefit Plans      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Net of Tax Amount (2,092) 495 (1,581)
Reclassification/amortization, Net of Tax Amount 2,276 1,825 1,714
Other comprehensive income/(loss), Before Tax Amount 204 3,502 150
Other comprehensive income/(loss), Tax (Expense)/Benefit (21) (1,182) (19)
Other comprehensive income/(loss) 184 2,320 132
Retirement-Related Benefit Plans, Prior Service Costs/(Credits)      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Before Tax Amount (182) 0  
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 31 0  
Unrealized gains/(losses) arising during the period, Net of Tax Amount (151) 0  
Reclassification/amortization, Before Tax Amount (73) (88) (107)
Reclassification/amortization, Tax (Expense)/Benefit 5 29 34
Reclassification/amortization, Net of Tax Amount (68) (58) (74)
Retirement-Related Benefit Plans, Net Gains/(Losses)      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Before Tax Amount (2,517) 682 (2,490)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 576 (201) 924
Unrealized gains/(losses) arising during the period, Net of Tax Amount (1,941) 481 (1,566)
Reclassification/amortization, Before Tax Amount 2,966 2,889 2,764
Reclassification/amortization, Tax (Expense)/Benefit (632) (1,006) (976)
Reclassification/amortization, Net of Tax Amount 2,334 1,883 1,788
Retirement-Related Benefit Plans, Curtailments and Settlements      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Unrealized gains/(losses) arising during the period, Before Tax Amount 11 19 (16)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit (2) (5) 1
Unrealized gains/(losses) arising during the period, Net of Tax Amount $ 9 $ 14 $ (15)
[1] * Recast to reflect adoption of the FASB guidance on presentation of net periodic pension and nonpension postretirement benefit costs.