Basis of Presentation (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) contract	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2023 USD ($) $ / shares	Sep. 30, 2022 USD ($) $ / shares		Dec. 31, 2022 USD ($)
Noncontrolling Interest [Line Items]
Number of annuity contracts entered into by the company relating to the change in PPP | contract	2
Pension settlement charge			$ 5,900	$ 0	$ 5,894	[1]
Pension settlement charge, net of tax			4,400
Income/(loss) from continuing operations		$ 1,714	$ (3,214)	$ 4,229	$ (1,087)
Earnings per share, basic (in dollars per share) | $ / shares		$ 1.87	$ (3.54)	$ 4.63	$ (1.19)
Earnings per share, diluted (in dollars per share) | $ / shares		$ 1.84	$ (3.54)	$ 4.58	$ (1.19)
Provision for/(benefit from) income taxes		$ 159	$ (1,287)	$ 702	$ (1,070)
Effective tax rate		8.50%		14.20%
Commitment With Third Party Financial Institution
Noncontrolling Interest [Line Items]
Contractual obligation		$ 99		$ 99			$ 60
Commitment With Third Party Financial Institution | Minimum
Noncontrolling Interest [Line Items]
Contractual obligation average payment term duration				90 days
Commitment With Third Party Financial Institution | Maximum
Noncontrolling Interest [Line Items]
Contractual obligation average payment term duration				120 days
Other (income) and expense
Noncontrolling Interest [Line Items]
Noncontrolling interest amounts, net of tax		4	4	$ 13	$ 14
Service Life
Noncontrolling Interest [Line Items]
Income/(loss) from continuing operations		$ 44		$ 175
Earnings per share, basic (in dollars per share) | $ / shares		$ 0.04		$ 0.16
Earnings per share, diluted (in dollars per share) | $ / shares		$ 0.04		$ 0.15
Service Life | Service and Network Equipment New
Noncontrolling Interest [Line Items]
Property, plant and equipment useful life		6 years		6 years			5 years
Service Life | Server and Network Equipment Used
Noncontrolling Interest [Line Items]
Property, plant and equipment useful life		4 years		4 years			3 years
U.S. Plans | Qualified Plan | Pension Plan
Noncontrolling Interest [Line Items]
Benefit plan obligation and plan assets transferred to insurers	$ 16,000
Pension settlement charge			5,900
Pension settlement charge, net of tax			4,400
Pension settlement charge, tax			$ 1,500

[1] ncludes immaterial cash flows from discontinued operations.