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Equity Activity - Reclassifications and Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost $ 40,659 $ 42,655 $ 42,196
SG&A expense 20,604 19,366 19,680
Other (income) and expense (968) 1,152 1,125
Interest expense 1,344 723 615
Provision for/(benefit from) income taxes 731 2,619 5,642
Net (income) loss (9,431) (8,728) (5,753)
Other comprehensive income/(loss) 893 (476) 2,806
Services      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 32,491 33,687 33,399
Sales      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 7,263 7,835 7,587
Financing      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 904 1,132 1,210
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 (663) (3,089) 1,206
Reclassification/amortization, Net of Tax Amount 1,556 2,612 1,599
Other comprehensive income/(loss), Before Tax Amount 1,029 (215) 3,235
Other comprehensive income/(loss), Tax (Expense)/Benefit (136) (262) (429)
Other comprehensive income/(loss) 893 (476) 2,806
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 (10) (902) 769
Reclassification/amortization, Net of Tax Amount     0
Other comprehensive income/(loss), Before Tax Amount (39) (730) 152
Other comprehensive income/(loss), Tax (Expense)/Benefit 29 (172) 617
Other comprehensive income/(loss) (10) (902) 769
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 1 (2) 1
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 0 1 (1)
Unrealized gains/(losses) arising during the period, Net of Tax Amount 1 (1) 0
Reclassification/amortization, Net of Tax Amount     1
Other comprehensive income/(loss), Before Tax Amount 1 (2) 2
Other comprehensive income/(loss), Tax (Expense)/Benefit 0 1 (1)
Other comprehensive income/(loss) 1 (1) 1
Net Unrealized Gains/(Losses) on Available-For-Sale Securities | Reclassifications      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Reclassification/amortization, Before Tax Amount     1
Reclassification/amortization, Tax (Expense)/Benefit     0
Reclassification/amortization, Net of Tax Amount     1
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 (689) (136) (58)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 167 43 0
Unrealized gains/(losses) arising during the period, Net of Tax Amount (522) (93) (58)
Reclassification/amortization, Net of Tax Amount 59 337 (226)
Other comprehensive income/(loss), Before Tax Amount (614) 313 (421)
Other comprehensive income/(loss), Tax (Expense)/Benefit 151 (69) 137
Other comprehensive income/(loss) (463) 244 (284)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
SG&A expense (53) 0 (11)
Other (income) and expense (39) 341 (324)
Interest expense 197 71 22
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Services      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost (68) (30) (70)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Sales      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost (51) (8) (3)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Financing      
Reclassifications and Taxes Related to Items of Other Comprehensive Income      
Cost 89 75 23
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 17 8 27
Net (income) loss (50) (22) (43)
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 15 3 1
Net (income) loss (37) (5) (3)
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 (22) (19) (9)
Net (income) loss 67 56 14
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 14 0 3
Net (income) loss (39) 0 (9)
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 10 (86) 124
Net (income) loss (29) 255 (199)
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 (50) (18) (8)
Net (income) loss 148 53 13
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 (131) (2,092) 495
Reclassification/amortization, Net of Tax Amount 1,496 2,276 1,825
Other comprehensive income/(loss), Before Tax Amount 1,681 204 3,502
Other comprehensive income/(loss), Tax (Expense)/Benefit (316) (21) (1,182)
Other comprehensive income/(loss) 1,365 184 2,320
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 (73) (182) 0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 10 31 0
Unrealized gains/(losses) arising during the period, Net of Tax Amount (63) (151) 0
Reclassification/amortization, Before Tax Amount (9) (73) (88)
Reclassification/amortization, Tax (Expense)/Benefit 5 5 29
Reclassification/amortization, Net of Tax Amount (4) (68) (58)
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 (120) (2,517) 682
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 52 576 (201)
Unrealized gains/(losses) arising during the period, Net of Tax Amount (68) (1,941) 481
Reclassification/amortization, Before Tax Amount 1,843 2,966 2,889
Reclassification/amortization, Tax (Expense)/Benefit (371) (632) (1,006)
Reclassification/amortization, Net of Tax Amount 1,471 2,334 1,883
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 41 11 19
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit (12) (2) (5)
Unrealized gains/(losses) arising during the period, Net of Tax Amount $ 29 $ 9 $ 14