Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($)
$ in Millions |
1 Months Ended |
12 Months Ended |
Aug. 31, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
$ 25,697
|
$ 24,297
|
$ 21,261
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
0
|
0
|
0
|
| Capital expenditures |
|
(9,953)
|
(9,774)
|
(9,550)
|
| Cash paid for intangible assets |
|
(2,475)
|
(1,935)
|
(1,605)
|
| Acquisitions and construction of real estate properties |
|
(54)
|
(143)
|
(418)
|
| Construction of Universal Beijing Resort |
|
(1,116)
|
(460)
|
(71)
|
| Acquisitions, net of cash acquired |
|
(370)
|
(38,219)
|
(532)
|
| Proceeds from sales of businesses and investments |
|
886
|
141
|
150
|
| Purchases of investments |
|
(1,899)
|
(1,257)
|
(2,292)
|
| Other |
|
140
|
793
|
785
|
| Net cash provided by (used in) investing activities |
|
(14,841)
|
(50,854)
|
(13,533)
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
(1,288)
|
379
|
(1,905)
|
| Proceeds from borrowings |
|
5,479
|
44,781
|
11,466
|
| Proceeds from collateralized obligation |
$ 5,200
|
5,175
|
0
|
0
|
| Repurchases and repayments of debt |
|
(14,354)
|
(8,798)
|
(6,364)
|
| Repurchases of common stock under repurchase program and employee plans |
|
(504)
|
(5,320)
|
(5,435)
|
| Dividends paid |
|
(3,735)
|
(3,352)
|
(2,883)
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
0
|
0
|
(2,299)
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
(311)
|
(277)
|
(252)
|
| Other |
|
357
|
(273)
|
100
|
| Net cash provided by (used in) financing activities |
|
(9,181)
|
27,140
|
(7,572)
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
5
|
(245)
|
0
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
1,680
|
338
|
156
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
3,909
|
3,571
|
3,415
|
| Cash, cash equivalents and restricted cash, end of year |
|
5,589
|
3,909
|
3,571
|
| Elimination and Consolidation Adjustments [Member] |
|
|
|
|
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
0
|
0
|
0
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
0
|
0
|
0
|
| Capital expenditures |
|
0
|
0
|
0
|
| Cash paid for intangible assets |
|
0
|
0
|
0
|
| Acquisitions and construction of real estate properties |
|
0
|
0
|
0
|
| Construction of Universal Beijing Resort |
|
0
|
0
|
0
|
| Acquisitions, net of cash acquired |
|
0
|
0
|
0
|
| Proceeds from sales of businesses and investments |
|
0
|
0
|
0
|
| Purchases of investments |
|
0
|
0
|
0
|
| Other |
|
0
|
0
|
0
|
| Net cash provided by (used in) investing activities |
|
0
|
0
|
0
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
0
|
0
|
0
|
| Proceeds from borrowings |
|
0
|
0
|
0
|
| Proceeds from collateralized obligation |
|
0
|
|
|
| Repurchases and repayments of debt |
|
0
|
0
|
0
|
| Repurchases of common stock under repurchase program and employee plans |
|
0
|
0
|
0
|
| Dividends paid |
|
0
|
0
|
0
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
|
|
0
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
0
|
0
|
0
|
| Other |
|
0
|
0
|
0
|
| Net cash provided by (used in) financing activities |
|
0
|
0
|
0
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
0
|
0
|
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, end of year |
|
0
|
0
|
0
|
| Comcast Parent [Member] | Reportable Legal Entities [Member] |
|
|
|
|
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
(1,693)
|
(2,245)
|
151
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
10,218
|
(26,179)
|
5,578
|
| Capital expenditures |
|
(42)
|
(27)
|
(12)
|
| Cash paid for intangible assets |
|
(4)
|
(4)
|
(4)
|
| Acquisitions and construction of real estate properties |
|
(51)
|
(105)
|
(267)
|
| Construction of Universal Beijing Resort |
|
0
|
0
|
0
|
| Acquisitions, net of cash acquired |
|
0
|
0
|
0
|
| Proceeds from sales of businesses and investments |
|
0
|
0
|
0
|
| Purchases of investments |
|
(36)
|
(126)
|
(70)
|
| Other |
|
0
|
148
|
101
|
| Net cash provided by (used in) investing activities |
|
10,085
|
(26,293)
|
5,326
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
0
|
(902)
|
(837)
|
| Proceeds from borrowings |
|
4,741
|
44,113
|
5,997
|
| Proceeds from collateralized obligation |
|
0
|
|
|
| Repurchases and repayments of debt |
|
(8,821)
|
(5,737)
|
(2,288)
|
| Repurchases of common stock under repurchase program and employee plans |
|
(504)
|
(5,320)
|
(5,435)
|
| Dividends paid |
|
(3,735)
|
(3,352)
|
(2,883)
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
|
|
0
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
0
|
0
|
0
|
| Other |
|
(78)
|
(201)
|
(31)
|
| Net cash provided by (used in) financing activities |
|
(8,397)
|
28,601
|
(5,477)
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
5
|
(63)
|
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, end of year |
|
0
|
0
|
0
|
| Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |
|
|
|
|
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
28,423
|
27,958
|
22,681
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
(13,373)
|
25,306
|
(7,777)
|
| Capital expenditures |
|
(9,911)
|
(9,747)
|
(9,538)
|
| Cash paid for intangible assets |
|
(2,471)
|
(1,931)
|
(1,601)
|
| Acquisitions and construction of real estate properties |
|
(3)
|
(38)
|
(151)
|
| Construction of Universal Beijing Resort |
|
(1,116)
|
(460)
|
(71)
|
| Acquisitions, net of cash acquired |
|
(370)
|
(38,219)
|
(532)
|
| Proceeds from sales of businesses and investments |
|
886
|
73
|
136
|
| Purchases of investments |
|
(1,791)
|
(1,081)
|
(2,090)
|
| Other |
|
140
|
196
|
626
|
| Net cash provided by (used in) investing activities |
|
(28,009)
|
(25,901)
|
(20,998)
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
(1,288)
|
1,281
|
(1,068)
|
| Proceeds from borrowings |
|
738
|
668
|
5,469
|
| Proceeds from collateralized obligation |
|
5,175
|
|
|
| Repurchases and repayments of debt |
|
(3,523)
|
(3,057)
|
(3,522)
|
| Repurchases of common stock under repurchase program and employee plans |
|
0
|
0
|
0
|
| Dividends paid |
|
0
|
0
|
0
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
|
|
(2,299)
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
(311)
|
(277)
|
(252)
|
| Other |
|
475
|
(72)
|
131
|
| Net cash provided by (used in) financing activities |
|
1,266
|
(1,457)
|
(1,541)
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
0
|
(182)
|
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
1,680
|
418
|
142
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
3,493
|
3,075
|
2,933
|
| Cash, cash equivalents and restricted cash, end of year |
|
5,173
|
3,493
|
3,075
|
| Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member] |
|
|
|
|
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
318
|
126
|
15
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
(318)
|
(575)
|
(5)
|
| Capital expenditures |
|
0
|
0
|
0
|
| Cash paid for intangible assets |
|
0
|
0
|
0
|
| Acquisitions and construction of real estate properties |
|
0
|
0
|
0
|
| Construction of Universal Beijing Resort |
|
0
|
0
|
0
|
| Acquisitions, net of cash acquired |
|
0
|
0
|
0
|
| Proceeds from sales of businesses and investments |
|
0
|
0
|
0
|
| Purchases of investments |
|
0
|
0
|
(10)
|
| Other |
|
0
|
449
|
0
|
| Net cash provided by (used in) investing activities |
|
(318)
|
(126)
|
(15)
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
0
|
0
|
0
|
| Proceeds from borrowings |
|
0
|
0
|
0
|
| Proceeds from collateralized obligation |
|
0
|
|
|
| Repurchases and repayments of debt |
|
0
|
0
|
0
|
| Repurchases of common stock under repurchase program and employee plans |
|
0
|
0
|
0
|
| Dividends paid |
|
0
|
0
|
0
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
|
|
0
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
0
|
0
|
0
|
| Other |
|
0
|
0
|
0
|
| Net cash provided by (used in) financing activities |
|
0
|
0
|
0
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
0
|
0
|
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, end of year |
|
0
|
0
|
0
|
| CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |
|
|
|
|
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
(119)
|
(112)
|
(147)
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
119
|
112
|
757
|
| Capital expenditures |
|
0
|
0
|
0
|
| Cash paid for intangible assets |
|
0
|
0
|
0
|
| Acquisitions and construction of real estate properties |
|
0
|
0
|
0
|
| Construction of Universal Beijing Resort |
|
0
|
0
|
0
|
| Acquisitions, net of cash acquired |
|
0
|
0
|
0
|
| Proceeds from sales of businesses and investments |
|
0
|
0
|
0
|
| Purchases of investments |
|
0
|
0
|
(60)
|
| Other |
|
0
|
0
|
0
|
| Net cash provided by (used in) investing activities |
|
119
|
112
|
697
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
0
|
0
|
0
|
| Proceeds from borrowings |
|
0
|
0
|
0
|
| Proceeds from collateralized obligation |
|
0
|
|
|
| Repurchases and repayments of debt |
|
0
|
0
|
(550)
|
| Repurchases of common stock under repurchase program and employee plans |
|
0
|
0
|
0
|
| Dividends paid |
|
0
|
0
|
0
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
|
|
0
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
0
|
0
|
0
|
| Other |
|
0
|
0
|
0
|
| Net cash provided by (used in) financing activities |
|
0
|
0
|
(550)
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
0
|
0
|
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
0
|
0
|
0
|
| Cash, cash equivalents and restricted cash, end of year |
|
0
|
0
|
0
|
| NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |
|
|
|
|
| Operating Activities |
|
|
|
|
| Net cash provided by (used in) operating activities |
|
(1,232)
|
(1,430)
|
(1,439)
|
| Investing Activities |
|
|
|
|
| Net transactions with affiliates |
|
3,354
|
1,336
|
1,447
|
| Capital expenditures |
|
0
|
0
|
0
|
| Cash paid for intangible assets |
|
0
|
0
|
0
|
| Acquisitions and construction of real estate properties |
|
0
|
0
|
0
|
| Construction of Universal Beijing Resort |
|
0
|
0
|
0
|
| Acquisitions, net of cash acquired |
|
0
|
0
|
0
|
| Proceeds from sales of businesses and investments |
|
0
|
68
|
14
|
| Purchases of investments |
|
(72)
|
(50)
|
(62)
|
| Other |
|
0
|
0
|
58
|
| Net cash provided by (used in) investing activities |
|
3,282
|
1,354
|
1,457
|
| Financing Activities |
|
|
|
|
| Proceeds from (repayments of) short-term borrowings, net |
|
0
|
0
|
0
|
| Proceeds from borrowings |
|
0
|
0
|
0
|
| Proceeds from collateralized obligation |
|
0
|
|
|
| Repurchases and repayments of debt |
|
(2,010)
|
(4)
|
(4)
|
| Repurchases of common stock under repurchase program and employee plans |
|
0
|
0
|
0
|
| Dividends paid |
|
0
|
0
|
0
|
| Purchase of Universal Studios Japan noncontrolling interests |
|
|
|
0
|
| Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock |
|
0
|
0
|
0
|
| Other |
|
(40)
|
0
|
0
|
| Net cash provided by (used in) financing activities |
|
(2,050)
|
(4)
|
(4)
|
| Impact of foreign currency on cash, cash equivalents and restricted cash |
|
0
|
0
|
|
| Increase (decrease) in cash and cash equivalents and restricted cash |
|
0
|
(80)
|
14
|
| Cash, cash equivalents and restricted cash, beginning of year |
|
416
|
496
|
482
|
| Cash, cash equivalents and restricted cash, end of year |
|
$ 416
|
$ 416
|
$ 496
|