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Significant accounting policies and practices (Tables)
 12 Months Ended
Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]  
Summary of effects of initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 A summary of the effects of the initial adoption of ASU 2016-01, ASU 2018-02 and ASC 606 on our shareholders’ equity follows (in millions).

 

 

ASU 2016-01

 

 

ASU 2018-02

 

 

ASC 606

 

 

Total

 

Increase (decrease):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Accumulated other comprehensive income

 

$

(61,459

)

 

$

84

 

 

$

—

 

 

$

(61,375

)

Retained earnings

 

 

61,459

 

 

 

(84

)

 

 

(70

)

 

 

61,305

 

Shareholders’ equity

 

 

—

 

 

 

—

 

 

 

(70

)

 

 

(70

)