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Summary of Significant Accounting Policies - 10-K - ASU 2014-09 (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Activation fee revenue recognition period (months) |  |  |  |  |  |  |  |  | 1 month |  |  |
Accumulated deficit | $ (1,143) |  |  |  | $ (2,057) |  |  |  | $ (1,143) | $ (2,057) |  |
Revenue | 2,062 | $ 2,011 | $ 1,977 | $ 1,744 | 1,496 | $ 1,468 | $ 1,432 | $ 1,375 | 7,794 | 5,771 | $ 5,425 |
Cost of services | (916) | $ (881) | $ (882) | $ (748) | (572) | $ (565) | $ (637) | $ (535) | 3,383 |  |  |
Subscriber acquisition costs |  |  |  |  |  |  |  |  | 427 | 470 | 499 |
Income tax expense |  |  |  |  |  |  |  |  | (283) | (245) | (616) |
Net income |  |  |  |  |  |  |  |  | 914 | 1,176 | 648 |
Accumulated other comprehensive income (loss), net of tax | $ 8 |  |  |  | $ (6) |  |  |  | 8 | (6) |  |
Subscription Revenue |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,120 | 5,264 | 4,990 |
Revenue Share and Royalties |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  | $ 2,291 | 1,394 | $ 1,210 |
Adjustments Due to ASU 2018-02 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | $ 4
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Subscriber acquisition costs |  |  |  |  |  |  |  |  |  | 4 |  |
Income tax expense |  |  |  |  |  |  |  |  |  | 0 |  |
Net income |  |  |  |  |  |  |  |  |  | 3 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Activation Fees |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reduction in deferred revenue |  |  |  |  |  |  |  |  |  |  |  | 8
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  | 8
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Loyalty Payments |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  | 10
Prepaid expense and other assets |  |  |  |  |  |  |  |  |  |  |  | $ 10
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Subscription Revenue |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 95 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Revenue Share and Royalties |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | 88 |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Subscriber acquisition costs |  |  |  |  |  |  |  |  |  | 474 |  |
Income tax expense |  |  |  |  |  |  |  |  |  | (245) |  |
Net income |  |  |  |  |  |  |  |  |  | 1,179 |  |
Calculated under Revenue Guidance in Effect before Topic 606 | Subscription Revenue |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 5,359 |  |
Calculated under Revenue Guidance in Effect before Topic 606 | Revenue Share and Royalties |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | $ 1,482 |  |

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