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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Revenue The following table provides total revenue by segment, sales channel and product category. It also provides the amount of revenue that is not subject to ASC 606, "Revenue from Contracts with Customers" ("ASC 606"), but is instead governed by other accounting standards:
Three Months Ended March 31, 2021Three Months Ended March 31, 2020
Total revenue
Adjustments for non-ASC 606 revenue (1)
Total revenue from contracts with customersTotal revenue
Adjustments for non-ASC 606 revenue (1)
Total revenue from contracts with customers
(Dollars in millions)
Business Segment by Sales Channel and Product Category
International and Global Accounts ("IGAM")
Compute and Application Services$179 (69)110 201 (69)132 
IP and Data Services427 — 427 437 — 437 
Fiber Infrastructure Services216 (30)186 202 (26)176 
Voice and Other191 — 191 201 — 201 
Total IGAM Revenue1,013 (99)914 1,041 (95)946 
Large Enterprise
Compute and Application Services165 (15)150 154 (17)137 
IP and Data Services395 — 395 401 — 401 
Fiber Infrastructure Services124 (15)109 138 (10)128 
Voice and Other253 — 253 273 — 273 
Total Large Enterprise Revenue937 (30)907 966 (27)939 
Mid-Market Enterprise
Compute and Application Services36 (8)28 34 (8)26 
IP and Data Services453 (1)452 466 (1)465 
Fiber Infrastructure Services60 (2)58 54 (4)50 
Voice and Other167 — 167 207 — 207 
Total Mid-Market Enterprise Revenue716 (11)705 761 (13)748 
Wholesale
Compute and Application Services48 (40)8 46 (40)6 
IP and Data Services305 — 305 318 — 318 
Fiber Infrastructure Services154 (31)123 153 (30)123 
Voice and Other422 (63)359 452 (68)384 
Total Wholesale Revenue929 (134)795 969 (138)831 
Business Segment by Product Category
Compute and Application Services428 (132)296 435 (134)301 
IP and Data Services1,580 (1)1,579 1,622 (1)1,621 
Fiber Infrastructure Services554 (78)476 547 (70)477 
Voice and Other1,033 (63)970 1,133 (68)1,065 
Total Business Segment Revenue$3,595 (274)3,321 3,737 (273)3,464 
Mass Markets Segment by Product Category
Consumer Broadband$731 (52)679 722 (53)669 
SBG Broadband39 (4)35 39 (3)36 
Three Months Ended March 31, 2021Three Months Ended March 31, 2020
Total revenue
Adjustments for non-ASC 606 revenue (1)
Total revenue from contracts with customersTotal revenue
Adjustments for non-ASC 606 revenue (1)
Total revenue from contracts with customers
(Dollars in millions)
Voice and Other541 (21)520 607 (29)578 
CAF II123 (123)— 123 (123)— 
Total Mass Markets Segment$1,434 (200)1,234 1,491 (208)1,283 
Total revenue$5,029 (474)4,555 5,228 (481)4,747 
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(1)Includes regulatory revenue and lease revenue not within the scope of ASC 606.
Contract with Customer, Asset and Liability
The following table provides balances of customer receivables, contract assets and contract liabilities as of March 31, 2021 and December 31, 2020:

March 31, 2021December 31, 2020
 (Dollars in millions)
Customer receivables(1)
$1,805 1,889 
Contract assets103 108 
Contract liabilities883 950 
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(1)Reflects gross customer receivables of $2.0 billion and $2.1 billion, net of allowance for credit losses of $148 million and $174 million, at March 31, 2021 and December 31, 2020, respectively.
Capitalized Contract Cost
The following table provides changes in our contract acquisition costs and fulfillment costs:

Three Months Ended March 31, 2021
Acquisition CostsFulfillment Costs
(Dollars in millions)
Beginning of period balance$289 216 
Costs incurred44 37 
Amortization(54)(37)
End of period balance$279 216 

Three Months Ended March 31, 2020
Acquisition CostsFulfillment Costs
(Dollars in millions)
Beginning of period balance$326 221 
Costs incurred49 36 
Amortization(55)(37)
End of period balance$320 220