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Debt and Credit Facilities (Tables)
12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Long-Term Debt
Long-Term Debt 
December 31
2016
 
2015
2.0% Senior Convertible Notes due 2020
$
988

 
$
969

3.5% senior notes due 2021
395

 
394

3.75% senior notes due 2022
746

 
745

3.5% senior notes due 2023
593

 
592

4.0% senior notes due 2024
588

 
587

6.5% debentures due 2025
117

 
118

7.5% debentures due 2025
345

 
345

6.5% debentures due 2028
36

 
36

6.625% senior notes due 2037
54

 
54

5.5% senior notes due 2044
396

 
396

5.22% debentures due 2097
91

 
90

Other long-term debt
52

 
29

 
4,401

 
4,355

Adjustments for unamortized gains on interest rate swap terminations
(5
)
 
(6
)
Less: current portion
(4
)
 
(4
)
Long-term debt
$
4,392

 
$
4,345