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Debt and Credit Facilities (Tables)
12 Months Ended
Dec. 31, 2016
Long-term Debt, Unclassified [Abstract]  
Maturities Of Long-Term Debt Disclosures
Summary of Total Debt
Senior unsecured notes:
2016
 
2015
 
Rate
 
Due
 
 
 
 
 
2.000%
 
09/30/2016
 
$

 
$
749

 
1.300%
 
04/01/2018
 
598

 
597

 
2.000%
 
03/08/2019
 
746

 

 
4.375%
 
01/15/2020
 
497

 
496

 
2.625%
 
03/15/2021
 
745

 

 
3.375%
 
05/15/2024
 
602

 
606

 
3.375%
 
11/01/2025
 
744

 
744

 
3.500%
 
03/15/2026
 
987

 

 
4.100%
 
04/01/2043
 
391

 
390

 
4.375%
 
05/15/2044
 
395

 
394

 
4.625%
 
03/15/2046
 
979

 

Commercial paper
 
200

 

Other
 
30

 
22

Total debt
 
$
6,914

 
$
3,998

Less current maturities
 
228

 
768

Total long-term debt
 
$
6,686

 
$
3,230

 
 
 
 
Unamortized debt issuance costs
$
45

 
$
24

Available borrowing capacity under all existing facilities
$
1,551

 
$
1,236

Fair value of debt
 
$
6,762

 
$
4,009