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Segment Reporting - Reconciliation of Consolidated Operating Income to Adjusted Operating Income (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 01, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]              
Operating income (GAAP measure)       $ 4,569 $ 4,326 $ 8,059 $ 7,903
Amortization of intangible assets       466 582 934 1,169
Gain on sale of subsidiary       (225) 0 (225) 0
Legal settlement       0 0 484 0
Loss on assets held for sale       0 0 41 0
Acquisition-related integration costs       0 40 0 81
Acquisition purchase price adjustment outside of measurement period     $ (61) 0 (61) 0 (61)
Adjusted operating income       4,810 $ 4,887 9,293 $ 9,092
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Payflex | Health Care Benefits              
Segment Reporting, Other Significant Reconciling Item [Line Items]              
Gain on sale of subsidiary       $ (225)   (225)  
Proceeds from divestiture of subsidiary $ 775            
State of Florida Settlement              
Segment Reporting, Other Significant Reconciling Item [Line Items]              
Legal settlement   $ 484       $ 484  
Legal settlement, period of payment   18 years   18 years   18 years