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Equity Activity - Reclassifications and Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Cost $ 10,825 $ 10,211 [1]
SG&A expense 5,445 5,027 [1]
Other (income) and expense 413 319 [1]
Interest expense 165 135
Continuing operations provision for (benefit from) income taxes (540) (329)
Net (income) loss (1,679) (1,750)
Other comprehensive income/(loss) 430 688
Sales    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Cost 1,722 1,530 [1]
Services    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Cost 8,835 8,401 [1]
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 (65) 284
Reclassification/amortization, Net of Tax Amount 495 404
Other comprehensive income/(loss), Before Tax Amount 573 779
Other comprehensive income/(loss), Tax (Expense)/Benefit (143) (92)
Other comprehensive income/(loss) 430 688
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 (115) 270
Reclassification/amortization, Net of Tax Amount 0 0
Other comprehensive income/(loss), Before Tax Amount (167) 161
Other comprehensive income/(loss), Tax (Expense)/Benefit 51 108
Other comprehensive income/(loss) (115) 270
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)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 1 0
Unrealized gains/(losses) arising during the period, Net of Tax Amount (2) (1)
Reclassification/amortization, Net of Tax Amount 0 1
Other comprehensive income/(loss), Before Tax Amount (3) 0
Other comprehensive income/(loss), Tax (Expense)/Benefit 1 0
Other comprehensive income/(loss) (2) 0
Net Unrealized Gains/(Losses) on Available-For-Sale Securities | Reclassifications    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Other (income) and expense 0 1
Continuing operations provision for (benefit from) income taxes 0 0
Net (income) loss 0 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 61 (33)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit (9) 8
Unrealized gains/(losses) arising during the period, Net of Tax Amount 51 (25)
Reclassification/amortization, Net of Tax Amount (41) (64)
Other comprehensive income/(loss), Before Tax Amount 7 (130)
Other comprehensive income/(loss), Tax (Expense)/Benefit 3 41
Other comprehensive income/(loss) 10 (89)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
SG&A expense 18 (20)
Other (income) and expense (104) (65)
Interest expense 34 7
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Sales    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Cost 17 (11)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Services    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Cost (19) (8)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of Sales    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Continuing operations provision for (benefit from) income taxes (5) 3
Net (income) loss 12 (8)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Cost of Services    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Continuing operations provision for (benefit from) income taxes 5 3
Net (income) loss (14) (5)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | SG&A Expense    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Continuing operations provision for (benefit from) income taxes (5) 5
Net (income) loss 13 (15)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Other (Income) and Expense    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Continuing operations provision for (benefit from) income taxes 26 25
Net (income) loss (78) (40)
Net Unrealized Gains/(Losses) on Cash Flow Hedges | Reclassifications | Interest Expense    
Reclassifications and Taxes Related to Items of Other Comprehensive Income    
Continuing operations provision for (benefit from) income taxes (8) (3)
Net (income) loss 25 5
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 0 40
Reclassification/amortization, Net of Tax Amount 537 466
Other comprehensive income/(loss), Before Tax Amount 735 748
Other comprehensive income/(loss), Tax (Expense)/Benefit (199) (241)
Other comprehensive income/(loss) 537 507
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 (1) 0
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 0 0
Unrealized gains/(losses) arising during the period, Net of Tax Amount (1) 0
Reclassification/amortization, Before Tax Amount (19) (21)
Reclassification/amortization, Tax (Expense)/Benefit 5 7
Reclassification/amortization, Net of Tax Amount (14) (15)
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 61
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit (1) (20)
Unrealized gains/(losses) arising during the period, Net of Tax Amount 1 41
Reclassification/amortization, Before Tax Amount 753 710
Reclassification/amortization, Tax (Expense)/Benefit (203) (229)
Reclassification/amortization, Net of Tax Amount 550 481
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 0 (1)
Unrealized gains/(losses) arising during the period, Tax (Expense)/Benefit 0 0
Unrealized gains/(losses) arising during the period, Net of Tax Amount $ 0 $ (1)
[1] Recast to reflect adoption of the FASB guidance on presentation of net periodic pension and nonpension postretirement benefit costs.