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Finance Charges (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Finance Charges
(in millions)
2016

2015

Interest
 - Long-term debt and capital lease and finance obligations
$
658

$
572

 
 - Short-term borrowings
10

8

Acquisition credit facilities (Notes 27 and 32)
39

—

Debt component of AFUDC
(29
)
(27
)
 
 
$
678

$
553