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Condensed Consolidated Statement of Changes in Equity (Unaudited) - USD ($)
$ in Millions
Total
Redeemable Noncontrolling Interests and Redeemable Subsidiary Preferred Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock at Cost [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
Class A Common Stock [Member]
Common Stock [Member]
Beginning balance at Dec. 31, 2019   $ 1,372              
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Redemption of subsidiary preferred stock   0              
Contributions from (distributions to) noncontrolling interests, net   (37)              
Other   (165)              
Net income (loss)   86              
Ending balance at Jun. 30, 2020   1,256              
Beginning balance at Dec. 31, 2019     $ 38,447 $ 50,695 $ (124) $ (7,517) $ 1,047 $ 1,148 $ 54
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock compensation plans     473            
Issuances of common stock under employee plans                 0
Repurchases of common stock under repurchase program and employee plans     (103) (168)          
Employee stock purchase plans     133            
Dividends declared       (2,125)          
Other comprehensive income (loss)             (2,326) (12)  
Contributions from (distributions to) noncontrolling interests, net               15  
Other     (14) 7       14  
Net income (loss) $ 5,135     5,135          
Net income (loss)               12  
Ending balance at Jun. 30, 2020 $ 84,791   38,936 53,420   (7,517) (1,279) 1,177 54
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends declared per common share (in dollars per share) $ 0.46                
Beginning balance at Mar. 31, 2020   1,259              
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Redemption of subsidiary preferred stock   0              
Contributions from (distributions to) noncontrolling interests, net   (10)              
Other   (12)              
Net income (loss)   19              
Ending balance at Jun. 30, 2020   1,256              
Beginning balance at Mar. 31, 2020     38,597 51,516 0 (7,517) (1,144) 1,277 54
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock compensation plans     261            
Issuances of common stock under employee plans                 0
Repurchases of common stock under repurchase program and employee plans     (10) (26)          
Employee stock purchase plans     79            
Dividends declared       (1,061)          
Other comprehensive income (loss)             (135) 2  
Contributions from (distributions to) noncontrolling interests, net               (105)  
Other     9 3       1  
Net income (loss) $ 2,988     2,988          
Net income (loss)               2  
Ending balance at Jun. 30, 2020 $ 84,791   38,936 53,420   (7,517) (1,279) 1,177 54
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends declared per common share (in dollars per share) $ 0.23                
Beginning balance at Dec. 31, 2020 $ 1,280 1,280              
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Redemption of subsidiary preferred stock   (725)              
Contributions from (distributions to) noncontrolling interests, net   (40)              
Other   (10)              
Net income (loss)   24              
Ending balance at Jun. 30, 2021 530 530              
Beginning balance at Dec. 31, 2020 91,738   39,464 56,438 0 (7,517) 1,884 1,415 54
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock compensation plans     570            
Issuances of common stock under employee plans                 1
Repurchases of common stock under repurchase program and employee plans     (131) (832)          
Employee stock purchase plans     139            
Dividends declared       (2,317)          
Other comprehensive income (loss)             108 10  
Contributions from (distributions to) noncontrolling interests, net               324  
Other     5 4       1  
Net income (loss) 7,067     7,067          
Net income (loss)               (169)  
Ending balance at Jun. 30, 2021 $ 96,516   40,046 60,359   (7,517) 1,992 1,581 55
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends declared per common share (in dollars per share) $ 0.50                
Beginning balance at Mar. 31, 2021   546              
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Redemption of subsidiary preferred stock   0              
Contributions from (distributions to) noncontrolling interests, net   (13)              
Other   0              
Net income (loss)   (3)              
Ending balance at Jun. 30, 2021 $ 530 $ 530              
Beginning balance at Mar. 31, 2021     39,744 58,321 $ 0 (7,517) 1,972 1,525 55
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock compensation plans     274            
Issuances of common stock under employee plans                 0
Repurchases of common stock under repurchase program and employee plans     (43) (543)          
Employee stock purchase plans     76            
Dividends declared       (1,156)          
Other comprehensive income (loss)             20 24  
Contributions from (distributions to) noncontrolling interests, net               135  
Other     (5) 0       2  
Net income (loss) 3,738     3,738          
Net income (loss)               (105)  
Ending balance at Jun. 30, 2021 $ 96,516   $ 40,046 $ 60,359   $ (7,517) $ 1,992 $ 1,581 $ 55
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Cash dividends declared per common share (in dollars per share) $ 0.25