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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2019
Derivative [Line Items]  
Schedule of Derivative Instruments [Table Text Block]
 
 
Current
 
Noncurrent
Interest rate (1)
 
$

 
$
71,400,000

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
(millions)
 
Fair Value - Derivatives under Hedge Accounting
 
Fair Value - Derivatives not under Hedge Accounting
 
Total Fair Value
At March 31, 2019
 
 
 
 
 
 
Current Liabilities
 
 
 
 
 
 
Interest rate
 
$
1

 
$

 
$
1

  Total current derivative liabilities (1)
 
1

 

 
1

Noncurrent Liabilities
 
 
 
 
 
 
Interest rate
 
9

 
4

 
13

  Total noncurrent derivative liabilities (2)
 
9

 
4

 
13

  Total derivative liabilities
 
$
10

 
$
4

 
$
14

 
 
 
 
 
 
 
At December 31, 2018
 
 
 
 
 
 
Current Liabilities
 
 
 
 
 
 
Interest rate
 
$
1

 
$

 
$
1

  Total current derivative liabilities (1)
 
1

 

 
1

Noncurrent Liabilities
 
 
 
 
 
 
Interest rate
 
7

 
3

 
10

  Total noncurrent derivative liabilities (2)
 
7

 
3

 
10

  Total derivative liabilities
 
$
8

 
$
3

 
$
11

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]
Derivatives in Cash Flow Hedging Relationships
 
Increase (Decrease) in Derivatives Subject to Regulatory Treatment (1)
(millions)
 
 
Three Months Ended March 31, 2019
 
 
Derivative type and location of gains (losses):
 
 
  Interest rate
 
$
(2
)
  Total
 
$
(2
)
 
 
 
Three Months Ended March 31, 2018
 
 
Derivative type and location of gains (losses):
 
 
  Interest rate
 
$
2

  Total
 
$
2

Derivatives Not Designated as Hedging Instruments [Table Text Block]
Derivatives Not designated as Hedging Instruments
(millions)
 
Increase (Decrease) in Derivatives Subject to Regulatory Treatment (1)
 
 
 
Amount of Gain (Loss) Recognized in Income on Derivatives (2)
Three months ended March 31,
 
2019

 
2018

 
Location
 
2019

 
2018

Derivative type and location of gains (losses):
 
 
 
 
 
 
 
 
 
 
  Interest rate contracts
 
$
(1
)
 
$
65

 
Other Income
 
$

 
$
115

Total
 
$
(1
)
 
$
65

 
Other Income
 
$

 
$
115

Disclosure of Credit Derivatives [Table Text Block]
Derivative Contracts with Credit Contingent Features
(millions)
 
March 31, 2019
 
December 31, 2018
in Net Liability Position
 
 
 
 
Aggregate fair value of derivatives in net liability position
 
$
14

 
$
11

Fair value of collateral already posted
 
14

 
11

Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered
 
$

 
$

Offsetting Liabilities [Table Text Block]
 
 
March 31, 2019
 
December 31, 2018
 
 
Gross Amounts Not Offset in the Consolidated Balance Sheet
 
Gross Amounts Not Offset in the Consolidated Balance Sheet
(millions)
 
Gross Liabilities Presented in the Consolidated Balance Sheet
 
Financial Instruments
 
Cash Collateral Paid
 
Net Amounts
 
Gross Liabilities Presented in the Consolidated Balance Sheet
 
Financial Instruments
 
Cash Collateral Paid
 
Net Amounts
Interest rate contracts:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  Over-the-counter
 
$
14

 
$

 
$
14

 
$

 
$
11

 
$

 
$
11

 
$

Total derivatives
 
$
14

 
$

 
$
14

 
$

 
$
11

 
$

 
$
11

 
$