The tables below present disaggregated revenues from contracts with clients by client location, service line and contract-type for each of our business segments. We believe this disaggregation best depicts how the nature, amount, timing and uncertainty of our revenues and cash flows are affected by industry, market and other economic factors. Revenues are attributed to regions based upon client location. Substantially all revenues in our North America region relate to operations in the United States.


	Three Months Ended March 31, 2020

	Financial Services		Healthcare		Products and Resources		Communications, Media and Technology		Total
	(in millions)
Revenues
Geography:
North America	$	1,012	$	1,038	$	689	$	451	$	3,190
United Kingdom	120		40		93		84		337
Continental Europe	191		99		109		38		437
Europe - Total	311		139		202		122		774
Rest of World	128		17		63		53		261
Total	$	1,451	$	1,194	$	954	$	626	$	4,225

Service line:
Consulting and technology services	$	947	$	662	$	590	$	348	$	2,547
Outsourcing services	504		532		364		278		1,678
Total	$	1,451	$	1,194	$	954	$	626	$	4,225

Type of contract:
Time and materials	$	884	$	475	$	409	$	383	$	2,151
Fixed-price	483		409		443		219		1,554
Transaction or volume-based	84		310		102		24		520
Total	$	1,451	$	1,194	$	954	$	626	$	4,225

We expect the COVID-19 pandemic to result in reduced demand across all our segments in the second quarter of 2020 and potentially longer. We expect demand from our retail and consumer goods clients and our travel and hospitality clients in our Products and Resources segment as well as communications and media clients in our Communications, Media and Technology segment to be particularly negatively impacted by the COVID-19 pandemic.


	Three Months Ended March 31, 2019

	Financial Services		Healthcare		Products and Resources		Communications, Media and Technology		Total
	(in millions)
Revenues
Geography:
North America	$	1,018	$	1,042	$	641	$	422	$	3,123
United Kingdom	129		25		94		81		329
Continental Europe	162		82		115		46		405
Europe - Total	291		107		209		127		734
Rest of World	127		16		64		46		253
Total	$	1,436	$	1,165	$	914	$	595	$	4,110

Service line:
Consulting and technology services	$	913	$	638	$	552	$	306	$	2,409
Outsourcing services	523		527		362		289		1,701
Total	$	1,436	$	1,165	$	914	$	595	$	4,110

Type of contract:
Time and materials	$	919	$	458	$	400	$	375	$	2,152
Fixed-price	464		400		414		190		1,468
Transaction or volume-based	53		307		100		30		490
Total	$	1,436	$	1,165	$	914	$	595	$	4,110

Costs to fulfill, such as set-up or transition activities, are recorded in "Other noncurrent assets" in our unaudited consolidated statements of financial position and the amortization expense of costs to fulfill is included in "Cost of revenues" in our unaudited consolidated statements of operations. Costs to obtain contracts were immaterial for the period disclosed. The following table presents information related to the capitalized costs to fulfill for the three months ended March 31:

A contract asset is a right to consideration that is conditional upon factors other than the passage of time. Contract assets are presented in "Other current assets" in our unaudited consolidated statements of financial position and primarily relate to unbilled amounts on fixed-price contracts utilizing the cost to cost method of revenue recognition. The table below shows significant movements in contract assets for the three months ended March 31:


	2020		2019
	(in millions)
Beginning balance	$	334	$	305
Revenues recognized during the period but not billed	219		238
Amounts reclassified to trade accounts receivable	(194)		(208)

Ending balance	$	359	$	335

Our contract liabilities, or deferred revenue, consist of advance payments and billings in excess of revenues recognized. The tables below show significant movements in the deferred revenue balances (current and noncurrent) for the three months ended March 31:


	2020		2019
	(in millions)
Beginning balance	$	336	$	348
Amounts billed but not recognized as revenues	257		205
Revenues recognized related to the opening balance of deferred revenue	(197)		(149)

Ending balance	$	396	$	404

Revenues recognized during the three months ended March 31, 2020 for performance obligations satisfied or partially satisfied in previous periods were immaterial.

As of March 31, 2020, the aggregate amount of transaction price allocated to remaining performance obligations, was $1,674 million of which approximately 70% is expected to be recognized as revenue within 2 years. Disclosure is not required for performance obligations that meet any of the following criteria:

(3)variable consideration allocated entirely to a wholly unsatisfied performance obligation or to a wholly unsatisfied promise to transfer a distinct good or service that forms part of a single performance obligation in accordance with ASC 606-10-25-14(b), for which the criteria in ASC 606-10-32-40 have been met, or

Many of our performance obligations meet one or more of these exemptions and therefore are not included in the remaining performance obligation amount disclosed above.

We calculate expected credit losses for our trade accounts receivable based on historical credit loss rates for each aging category as adjusted for the current market conditions and forecasts about future economic conditions. The following table presents the activity in the allowance for doubtful accounts for trade accounts receivable:


	Allowance for Doubtful Accounts
	(in millions)
Balance - December 31, 2019	$	67
Impact of adoption of the Credit Loss Standard	(1)
Current-period provision for expected credit losses	10
Write-offs charged against the allowance	(2)

Balance - March 31, 2020	$	74