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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2017
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 classified as Level 2 within the fair value hierarchy.
(in millions)
September 30,
2017
December 31,
2016
Total debt at par value
$
8,473

$
7,112

Unamortized discount and debt issue cost, net
(97
)
(104
)
Net carrying amount
$
8,376

$
7,008

 
 
 
Fair value
$
8,700

$
7,300