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General - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Apr. 01, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Apr. 01, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible assets | $ 55,000,000 | $ 55,000,000 | $ 0 |  |  |  |  |  |  |  |
Lease liabilities | 558,000,000 | 558,000,000 |  |  |  |  |  |  |  |  |
Right-of-Use asset | $ 461,000,000 | $ 461,000,000 |  |  |  |  |  |  |  |  |
Operating lease, renewal term | 20 years | 20 years |  |  |  |  |  |  |  |  |
Operating lease, option to terminate |  | 60 days |  |  |  |  |  |  |  |  |
Lease, cost | $ 42,000,000 | $ 83,000,000 |  |  |  |  |  |  |  |  |
Variable lease, cost | 8,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |
Stockholders' equity | (24,476,000,000) | (24,476,000,000) | (23,122,000,000) |  |  |  | $ (21,312,000,000) |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  | $ 585,000,000 |  |  |  |  |
Right-of-Use asset |  |  |  |  |  | 488,000,000 |  |  |  |  |
Retained income |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | $ 0 |  | 21,000,000 |  | $ 0 |  | $ 1,088,000,000 |
Stockholders' equity | (45,803,000,000) | (45,803,000,000) | (43,997,000,000) |  | $ (45,148,000,000) |  | (44,033,000,000) |  | $ (43,479,000,000) |  | $ (41,579,000,000)
Retained income | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  |  |  | 21,000,000 |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | 0 |  | 0 |  | $ 0 |  | (910,000,000) |
Stockholders' equity | $ (1,760,000,000) | $ (1,760,000,000) | (243,000,000) |  | (1,085,000,000) |  | (118,000,000) |  | (398,000,000) |  | (1,889,000,000)
Minimum |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease, term of contract | 1 year | 1 year |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating lease, term of contract | 11 years | 11 years |  |  |  |  |  |  |  |  |
Impact of change | Impact of change |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 227,000,000 | $ 227,000,000 | 0 |  |  |  |  |  |  | 0 |
Impact of change | Impact of change | Retained income |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | 0 |  | 0 |  |  |  | 0 |
Stockholders' equity | 1,739,000,000 | 1,739,000,000 | 1,511,000,000 | 18,000,000 | 1,670,000,000 |  | 1,675,000,000 |  | 1,552,000,000 | 1,580,000,000 | 1,583,000,000
Impact of change | Impact of change | Accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  |  | 0 |  | $ 0 |  |  |  | 0 |
Stockholders' equity | $ (1,512,000,000) | $ (1,512,000,000) | $ (1,511,000,000) | $ (18,000,000) | $ (1,651,000,000) |  | $ (1,675,000,000) |  | $ (1,548,000,000) | $ (1,580,000,000) | $ (1,583,000,000)

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