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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Schedule of estimated fair value of debt instruments The fair value of debt, shown below, is principally based on reported market values, recently completed market transactions and estimates based on interest rates, maturities, credit risk and underlying collateral. Long-term debt is primarily classified as Level 2 within the fair value hierarchy.
(in millions)
September 30,
2016
December 31,
2015
Total debt at par value
$
7,402

$
8,098

Unamortized discount and debt issue cost, net
(110
)
(152
)
Net carrying amount
$
7,292

$
7,946

 
 
 
Fair value
$
7,700

$
8,400