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Debt and Credit Facilities (Tables)
 12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Long-Term Debt
Long-Term Debt 
December 31
2014
 
2013
6.0% senior notes due 2017
$
—

 
$
399

3.5% senior notes due 2021
395

 
—

3.75% senior notes due 2022
748

 
747

3.5% senior notes due 2023
594

 
593

4.0% senior notes due 2024
589

 
—

6.5% debentures due 2025
118

 
118

7.5% debentures due 2025
346

 
346

6.5% debentures due 2028
36

 
36

6.625% senior notes due 2037
54

 
54

5.5% senior notes due 2044
400

 
—

5.22% debentures due 2097
91

 
89

Other long-term debt
36

 
58

 
3,407

 
2,440

Adjustments for unamortized gains on interest rate swap terminations
(7
)
 
21

Less: current portion
(4
)
 
(4
)
Long-term debt
$
3,396

 
$
2,457