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v3.20.2

Significant Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) numberOfSegments | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of reportable segments | numberOfSegments | 4 |  |  |  |  |
Cumulative-effect adjustment to beginning retained earnings | $ 6,090 | $ 5,653 | $ 5,309 | $ 6,692 | $ 8,068 | $ 8,287
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |
Allowance for credit losses | 219 |  |  |  |  |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment to beginning retained earnings | $ 13,890 | $ 13,384 | 13,022 | $ 11,965 | $ 12,770 | 12,409
Opening retained earnings adjustment: adoption of new accounting standard |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment to beginning retained earnings |  |  | (13) |  |  | 11
Opening retained earnings adjustment: adoption of new accounting standard | Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment to beginning retained earnings |  |  | (13) |  |  | $ 11
ASU 2016-13 | Opening retained earnings adjustment: adoption of new accounting standard | Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative-effect adjustment to beginning retained earnings |  |  | $ 13 |  |  |

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