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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income
The tables below present the changes in AOCI by component for the years ended December 31, 2017, 2018 and 2019:
 
Net Unrealized
Gains (Losses)
on Investments
with OTTI
Losses
   
Net Other
Unrealized
Gains (Losses)
on Investments
    
Unrealized
Gains (Losses)
on Cash Flow
Hedges
    
Pension and
Postretirement
Benefits
   
Foreign
Currency
Translation
    
Total
Accumulated
Other
Comprehensive
Income (Loss)
 
(In millions)
 
 
  
 
  
 
  
 
  
 
  
 
Balance, January 1, 2017
 
$
 
27
   
$
 
576
   
$
 
(2
 )  
$
 
(646
 )  
$
 
(178
 )  
$
 
(223
 )
Other comprehensive income (loss) before reclassifications, after tax of $1, $(106), $(2), $4 and $0
   
(3
 )    
190
     
1
     
(18
 )    
100
     
270
 
Reclassification of (gains) losses from accumulated other comprehensive loss, after tax of $1, $38, $0, $(16) and $0
   
(2
 )    
(82
 )    
2
     
30
     
     
(52
 )
                                                 
Other comprehensive income (loss)
   
(5
 )    
108
     
3
     
12
     
100
     
218
 
Amounts attributable to noncontrolling interests
   
     
(11
 )    
(1
 )    
1
     
(10
 )    
(21
 )
                                                 
Balance, December 31, 2017
   
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
)