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Shareholders' equity Share Repurchases (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 19, 2021 | Feb. 01, 2021 | Nov. 19, 2020 | Nov. 21, 2019
Nov 2019 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 1,500
Number of shares repurchased |  |  | 0 |  | 2,266,150 |  |  |  |
Cost of shares repurchased |  |  | $ 0 |  | $ 326 |  |  |  |
Repurchase authorization remaining at end of period |  |  | $ 1,124 |  | $ 1,124 |  |  |  |
Nov 2020 Stock Repurchase Plan |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 2,500 | $ 1,500 |
Number of shares repurchased |  | 11,355,400 |  | 14,465,400 |  |  |  |  |
Cost of shares repurchased |  | $ 1,921 |  | $ 2,440 |  |  |  |  |
Repurchase authorization remaining at end of period |  | $ 65 |  | $ 65 |  |  |  |  |
CB_Increase(Decrease)StockRepurchaseProgramAuthorizedAmount |  |  |  |  |  |  | $ 1,000 |  |
Subsequent Event [Member] | Nov 2020 Stock Repurchase Plan |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares repurchased | 0 |  |  |  |  |  |  |  |
Cost of shares repurchased | $ 0 |  |  |  |  |  |  |  |
Subsequent Event [Member] | July 2021 Stock Repurchase Plan |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 5,000 |  |  |
Repurchase authorization remaining at end of period | $ 5,065 |  |  |  |  |  |  |  |

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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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