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Summary of Significant Accounting Policies - Accounting standards (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Present value of lease liabilities |  | $ 586,000,000 |  |  |  |  |  |  |
Right of use asset |  | $ 483,000,000 |  |  |  |  |  |  |
Expected returns on plan assets, smoothing period |  | 5 years |  |  |  |  |  |  |
Total shareholders’ equity |  | $ 25,998,000,000 |  | $ 21,312,000,000 |  | $ 22,551,000,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Present value of 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 |  |  | 21,000,000 |  | $ 1,088,000,000 |  |  |  | $ 0
Total shareholders’ equity |  | 48,074,000,000 |  | 44,033,000,000 |  | 41,579,000,000 |  | $ 39,009,000,000 |
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 |  |  |  |  |  |
Forecast | Retained income | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle | $ (100,000,000) |  |  |  |  |  |  |  |
Allowance for credit loss, increase (decrease) | $ 300,000,000 |  |  |  |  |  |  |  |
Change in accounting principle | Change in accounting principle |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Total shareholders’ equity |  | (158,000,000) | (41,000,000) | 0 | 0 |  |  |  |
Change in accounting principle | Change in accounting principle | Retained income |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting principle |  |  | $ 0 |  | $ 0 |  |  |  |
Total shareholders’ equity |  | $ (1,639,000,000) |  | $ (1,675,000,000) |  | $ (1,583,000,000) | $ (1,580,000,000) | $ (1,669,000,000) |

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