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Assets and Liabilities Measured at Fair Value (Tables)
 6 Months Ended
Jun. 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 June 30, 2020 and December 31, 2019, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
 
 
June 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
 
$
410
 
 
$
—
 
 
$
410
 
 
$
—
 
Money market funds and other
 
 
59
 
 
 
59
 
 
 
—
 
 
 
—
 
 
 
 
    
 
 
    
 
 
    
 
 
  
Investments of insurance subsidiaries
 
 
469
 
 
 
59
 
 
 
410
 
 
 
—
 
Less amounts classified as current assets
 
 
(105
) 
 
 
(58
) 
 
 
(47
) 
 
 
—
 
 
 
 
    
 
 
    
 
 
    
 
 
  
 
$
364
 
 
$
1
 
 
$
363
 
 
$
—
 
 
 
 
    
 
 
    
 
 
    
 
 
  
Liabilities:
 
 
 
 
Interest rate swaps (Income taxes and other liabilities)
 
$
64
 
 
$
—
 
 
$
64
 
 
$
—
 
 
 
 
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
 
 
$
—