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Assets and Liabilities Measured at Fair Value (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on Recurring Basis
The following tables summarize our assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
 
  
September 30, 2020
 
 
  
 
 
 
Fair Value Measurements Using
 
 
  
Fair Value
 
 
Quoted Prices in

Active Markets for

Identical Assets

and Liabilities

(Level 1)
 
 
Significant Other

Observable Inputs

(Level 2)
 
 
Significant

Unobservable Inputs

(Level 3)
 
Assets:
  
 
 
 
Investments of insurance subsidiaries:
  
 
 
 
Debt securities
  
$
415
 
 
$
—
 
 
$
415
 
 
$
—
 
Money market funds and other
  
 
71
 
 
 
71
 
 
 
—
 
 
 
—
 
  
 
 
    
 
 
    
 
 
    
 
 
  
Investments of insurance subsidiaries
  
 
486
 
 
 
71
 
 
 
415
 
 
 
—
 
Less amounts classified as current assets
  
 
(96
) 
 
 
(70
) 
 
 
(26
) 
 
 
—
 
  
 
 
    
 
 
    
 
 
    
 
 
  
  
$
390
 
 
$
1
 
 
$
389
 
 
$
—
 
  
 
 
    
 
 
    
 
 
    
 
 
  
Liabilities:
  
 
 
 
Interest rate swaps (Income taxes and other liabilities)
  
$
55
 
 
$
—
 
 
$
55
 
 
$
—
 
  
 
 
 
 
  
December 31, 2019
 
 
  
 
 
 
Fair Value Measurements Using
 
 
  
Fair Value
 
 
Quoted Prices in

Active Markets for

Identical Assets

and Liabilities

(Level 1)
 
 
Significant Other

Observable Inputs

(Level 2)
 
 
Significant

Unobservable Inputs

(Level 3)
 
Assets:
  
 
 
 
Investments of insurance subsidiaries:
  
 
 
 
Debt securities
  
$
377
 
 
$
—
 
 
$
377
 
 
$
—
 
Money market funds and other
  
 
85
 
 
 
85
 
 
 
—
 
 
 
—
 
  
 
 
    
 
 
    
 
 
    
 
 
  
Investments of insurance subsidiaries
  
 
462
 
 
 
85
 
 
 
377
 
 
 
—
 
Less amounts classified as current assets
  
 
(147
) 
 
 
(83
) 
 
 
(64
) 
 
 
—
 
  
 
 
    
 
 
    
 
 
    
 
 
  
  
$
315
 
 
$
2
 
 
$
313
 
 
$
—
 
  
 
 
    
 
 
    
 
 
    
 
 
  
Interest rate swaps (Other)
  
$
3
 
 
$
—
 
 
$
3
 
 
$
—
 
Liabilities:
  
 
 
 
Interest rate swaps (Income taxes and other liabilities)
  
$
7
 
 
$
—
 
 
$
7
 
 
$
—