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Cash flows reconciliation - cash flow from investing activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash Flows Reconciliation      
Disbursement related to VNC sale $ (555)
Proceeds from sale of CSI 437
Proceeds from sale of Midwestern System, net of cash 140
Proceeds from disposal of Mosaic shares 1,259
Proceeds from sale of Vale Florestar 9 10 10
Proceeds from disposal of VLI shares 241
Proceeds from sale of Longyu 156
Proceeds from disposal of investments, net $ 586 $ 714 $ 407