Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Contract with Customer, Asset and Liability [Abstract]
Beginning of period contract liability recorded as customer contract revenue during period	$ 2,821
Revenue, Performance Obligation [Abstract]
Aggregate amount of the transaction price allocated to remaining performance obligations	36,722
Prepaid and other current assets
Contract with Customer, Asset and Liability [Abstract]
Contract asset balance - current portion	3,058	$ 2,941
Deferred Acquisition Costs
Capitalized Contract Cost [Line Items]
Excluded deferred costs	6,950	6,806
Deferred Acquisition Costs | Prepaid and other current assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	2,988	2,893
Deferred Acquisition Costs | Other Assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 3,962	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	$ 6,566	6,687
Deferred Fulfillment Costs | Prepaid and other current assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	2,433	2,481
Deferred Fulfillment Costs | Other Assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 4,133	$ 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