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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule Of Accumulated Other Comprehensive Income (Loss) Table
The following summarizes the after-tax changes in the balances of accumulated other comprehensive income (loss):
millions
Interest-rate
Derivatives
Previously
Subject to Hedge
Accounting
 
Pension
and Other Postretirement
Plans
 
 
Total

Balance at December 31, 2015
 
$
(42
)
 
$
(341
)
 
$
(383
)
Other comprehensive income (loss), before reclassifications
 
—

 
(107
)
 
(107
)
Reclassifications to Consolidated Statement of Income
 
5

 
94

 
99

Net other comprehensive income (loss)
 
5

 
(13
)
 
(8
)
Balance at December 31, 2016
 
$
(37
)
 
$
(354
)
 
$
(391
)
Other comprehensive income (loss), before reclassifications
 
—

 
(10
)
 
(10
)
Reclassifications to Consolidated Statement of Income
 
2

 
61

 
63

Net other comprehensive income (loss)
 
2

 
51

 
53

Balance at December 31, 2017
 
$
(35
)
 
$
(303
)
 
$
(338
)
Other comprehensive income (loss), before reclassifications
 
—

 
39

 
39

Reclassifications to Consolidated Statement of Income
 
2

 
35

 
37

Cumulative effect of accounting change (1)
 
(7
)
 
(66
)
 
(73
)
Net other comprehensive income (loss)
 
(5
)
 
8

 
3

Balance at December 31, 2018
 
$
(40
)
 
$
(295
)
 
$
(335
)

(1) 
Beginning January 1, 2018, the Company adopted ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. See Note 1—Summary of Significant Accounting Policies in the Notes to Consolidated Financial Statements for further information.