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General - Additional Information (Details) - USD ($) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 23,418,000,000 |  | $ 21,312,000,000 | $ 23,273,000,000 |  |
Lease liabilities | 572,000,000 |  |  |  |  |
Right-of-Use asset | 474,000,000 |  |  |  |  |
Operating lease, cost | 41,000,000 |  |  |  |  |
Variable lease, cost | $ 7,000,000 |  |  |  |  |
Operating lease, renewal term | 14 years |  |  |  |  |
Operating lease, option to terminate | 60 days |  |  |  |  |
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] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 45,148,000,000 |  | 44,033,000,000 | 43,479,000,000 |  | $ 41,579,000,000
Cumulative effect of change in accounting principle |  | 21,000,000 |  |  | $ 1,088,000,000 |
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] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,085,000,000 |  | 118,000,000 | 398,000,000 |  | 1,889,000,000
Cumulative effect of change in accounting principle |  | 0 |  |  | (910,000,000) |
Minimum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease, term of contract | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Operating lease, term of contract | 11 years |  |  |  |  |
Adjustment | Impact of change |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ (19,000,000) | 0 |  | (4,000,000) |  |
Adjustment | Impact of change | Retained income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | (1,670,000,000) |  | (1,675,000,000) | (1,552,000,000) |  | (1,583,000,000)
Cumulative effect of change in accounting principle |  | 0 |  |  | 0 |
Adjustment | Impact of change | Accumulated other comprehensive income |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 1,651,000,000 | 1,580,000,000 | $ 1,675,000,000 | $ 1,548,000,000 |  | $ 1,583,000,000
Cumulative effect of change in accounting principle |  | $ 0 |  |  | $ 0 |

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