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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Shareholders' Equity [Abstract]  
Components of Accumulated Other Comprehensive Income

The tables below present the changes in AOCI by component for the years ended December 31, 2018, 2019 and 2020:

  
Net Unrealized
                            
Total
  
   
Gains (Losses)
    
Net Other
    
Unrealized
                
Accumulated
  
   
on Investments
    
Unrealized
    
Gains (Losses)
    
Pension and
    
Foreign
    
Other
  
   
with OTTI
    
Gains (Losses)
    
on Cash Flow
    
Postretirement
    
Currency
    
Comprehensive
  
   
Losses
    
on Investments
    
Hedges
    
Benefits
    
Translation
    
Income (Loss)
  
(In millions)
                                    
                                     
Balance, January 1, 2018, as reported
  
$
22
    
$
673
    
$
-
    
$
(633
)
  
$
(88
)
  
$
(26
)
Cumulative effect adjustment from changes in accounting standards, after tax of $0, $8, $0, $0 and $0
    
4
      
98
              
(130
)
            
(28
)
Balance, January 1, 2018, as adjusted
    
26
      
771
      
-
      
(763
)
    
(88
)
    
(54
)
Other comprehensive income (loss) before reclassifications, after tax of $2, $213, $(2), $9 and $0
    
(7
)
    
(801
)
    
4
      
(34
)
    
(84
)
    
(922
)
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $2, $(2), $0, $(6) and $0
    
(7
)
    
3
      
2
      
32
              
30
  
Other comprehensive income (loss)
    
(14
)
    
(798
)
    
6
      
(2
)
    
(84
)
    
(892
)
Amounts attributable to noncontrolling interests
    
2
      
84
                      
9
      
95
  
Purchase of Boardwalk Pipelines common units
                    
(1
)
    
(28
)
            
(29
)
Balance, December 31, 2018
    
14
      
57
      
5
      
(793
)
    
(163
)
    
(880
)
Other comprehensive income (loss) before reclassifications, after tax of $3, $(256), $5, $28 and $0
    
(13
)
    
957
      
(11
)
    
(102
)
    
42
      
873
  
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $(3), $1, $0, $(9) and $0
    
12
      
(8
)
            
34
              
38
  
Other comprehensive income (loss)
    
(1
)
    
949
      
(11
)
    
(68
)
    
42
      
911
  
Amounts attributable to noncontrolling interests
            
(101
)
            
6
      
(4
)
    
(99
)
Balance, December 31, 2019
  
$
13
    
$
905
    
$
(6
)
  
$
(855
)
  
$
(125
)
  
$
(68
)

Balance, January 1, 2020 (a)
  
$
-
    
$
918
    
$
(6
)
  
$
(855
)
  
$
(125
)
  
$
(68
)
Other comprehensive income (loss) before reclassifications, after tax of $12, $(201), $8, $18 and $0
    
(43
)
    
763
      
(22
)
    
(66
)
    
48
      
680
  
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $(12), $12, $(2), $(11) and $0
    
43
      
(43
)
    
5
      
42
              
47
  
Other comprehensive income (loss)
    
-
      
720
      
(17
)
    
(24
)
    
48
      
727
  
Amounts attributable to noncontrolling interests
            
(75
)
            
2
      
(5
)
    
(78
)
Balance, December 31, 2020
  
$
-
    
$
1,563
    
$
(23
)
  
$
(877
)
  
$
(82
)
  
$
581
  

(a)
On January 1, 2020, the Company adopted ASU 2016-13; see Note 1. The Net Unrealized Gains (Losses) on Investments with OTTI Losses column that tracked the change in unrealized gains (losses) on investments with OTTI losses has been replaced with the Net Unrealized Gains (Losses) on Investments with an Allowance for Credit Losses column. The balance as of January 1, 2020 in the Net Unrealized Gains (Losses) on Investments with OTTI Losses column is now reported in the Net Unrealized Gains (Losses) on Other Investments column. Prior period amounts were not adjusted for the adoption of this standard.