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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 18, 2022
Jan. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense     $ 2.9 $ 1.3 $ 3.0
Restricted Stock Units Equity Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]          
Nonvested awards January 1,   0 0    
Granted 15,931,000   16,267,000    
Vested     0    
Undistributed vested awards [1]     3,141,000    
Nonvested awards December 31,     13,126,000 0  
Granted, weighted average grant date fair value     $ 65.83    
Undistributed vested awards, weighted average grant date fair value per share [1]     65.83    
Unvested, weighted average grant date fair value per share, ending balance     $ 65.83    
Restricted Stock Units Liability Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]          
Nonvested awards January 1,   7,003,000 7,003,000    
Granted     0    
Vested     0    
Undistributed vested awards [2]     939,000    
Nonvested awards December 31,     6,064,000 7,003,000  
Performance Units Liability Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]          
Nonvested awards January 1,   7,003,000 7,003,000    
Granted 10,395,000   10,187,000    
Vested     0    
Undistributed vested awards [3]     3,320,000    
Nonvested awards December 31,     13,870,000 7,003,000  
Weighted average fair Value of each nonvested award     $ 104.76    
Weighted average estimated payout percent based on performance criteria     127.40%    
Performance Units Liability Awards [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards to be granted as percentage of target units     200.00%    
Performance Units Liability Awards [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards to be granted as percentage of target units     0.00%    
2006 Performance Unit Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     0    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]          
Nonvested awards January 1,   17,420,000 17,420,000    
Granted     0    
Vested     (11,660,000)    
Nonvested awards December 31,     5,760,000 17,420,000  
2006 Performance Unit Plan [Member] | Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     5 years    
2013 Director Incentive Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     0    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested [Roll Forward]          
Nonvested awards January 1,   4,286,000 4,286,000    
Granted     0    
Vested     (2,814,000)    
Nonvested awards December 31,     1,472,000 4,286,000  
2013 Director Incentive Agreement [Member] | Performance Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
2006 Performance Unit Plan and 2013 Director Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash payments distributed related to awards previously granted and now payable   $ 1.9      
2021 Long Term Incentive Plan [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock to be issued with plan     500,000,000    
[1] Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2021.
[2] Represents restricted stock units that vested but were not distributed to retirement-eligible employees during 2021.
[3] Represents performance units that vested but were not distributed to retirement-eligible employees during 2021.