Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Contract with Customer, Asset and Liability [Abstract]
Contract liability balance - current portion	$ 3,703	$ 3,918
Beginning of period contract liability recorded as customer contract revenue during period	3,576
Revenue, Performance Obligation [Abstract]
Aggregate amount of the transaction price allocated to remaining performance obligations	36,686
Prepaid and other current assets
Contract with Customer, Asset and Liability [Abstract]
Contract asset balance - current portion	3,283	2,941
Deferred Acquisition Costs
Capitalized Contract Cost [Line Items]
Excluded deferred costs	7,131	6,806
Deferred Acquisition Costs | Prepaid and other current assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	3,141	2,893
Deferred Acquisition Costs | Other Assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 3,990	3,913
Deferred Acquisition Costs | Minimum
Capitalized Contract Cost [Line Items]
Amortization period for deferred customer contract acquisition and fulfillment costs	3 years
Deferred Acquisition Costs | Maximum
Capitalized Contract Cost [Line Items]
Amortization period for deferred customer contract acquisition and fulfillment costs	5 years
Deferred Fulfillment Costs
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 6,315	6,687
Deferred Fulfillment Costs | Prepaid and other current assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	2,380	2,481
Deferred Fulfillment Costs | Other Assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 3,935	$ 4,206
Deferred Fulfillment Costs | Minimum
Capitalized Contract Cost [Line Items]
Amortization period for deferred customer contract acquisition and fulfillment costs	3 years
Deferred Fulfillment Costs | Maximum
Capitalized Contract Cost [Line Items]
Amortization period for deferred customer contract acquisition and fulfillment costs	5 years