Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Contract with Customer, Asset and Liability [Abstract]
Beginning of period contract liability recorded as customer contract revenue during period	$ 3,527
Revenue, Performance Obligation [Abstract]
Aggregate amount of the transaction price allocated to remaining performance obligations	34,309
Prepaid and other current assets
Contract with Customer, Asset and Liability [Abstract]
Contract asset balance - current portion	2,827	$ 2,582
Deferred Acquisition Costs
Capitalized Contract Cost [Line Items]
Excluded deferred costs	6,562	5,798
Deferred Acquisition Costs | Prepaid and other current assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	2,772	2,551
Deferred Acquisition Costs | Other Assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 3,790	3,247
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	$ 6,741	6,748
Deferred Fulfillment Costs | Prepaid and other current assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	2,489	2,600
Deferred Fulfillment Costs | Other Assets
Capitalized Contract Cost [Line Items]
Excluded deferred costs	$ 4,252	$ 4,148
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