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Debt - Components (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Short-term debt:          
Total short-term debt $ 999     $ 1,287  
Long-term debt:          
Senior notes, net of unamortized discounts and debt issuance costs 9,698     8,699  
Noncurrent portion of other long-term debt 677     5  
Total long-term debt 10,375     8,704  
Total debt 11,374     9,991  
Senior notes          
Long-term debt:          
Unamortized discounts and debt issuance costs (77)     (76)  
Senior notes, net of unamortized discounts and debt issuance costs 9,698     8,699  
5.25% senior notes due June 2015          
Short-term debt:          
Current portion of long-term notes and other debt       $ 150  
Long-term debt:          
Debt instrument, interest rate (as a percent)     5.25% 5.25%  
3.95% senior notes due September 2015          
Short-term debt:          
Current portion of long-term notes and other debt       $ 400  
Long-term debt:          
Debt instrument, interest rate (as a percent)   3.95%   3.95%  
5.88% senior notes due August 2016          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 175     $ 175  
Debt instrument, interest rate (as a percent) 5.88%     5.88%  
6.13% senior notes due January 2017          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 400     $ 400  
Debt instrument, interest rate (as a percent) 6.13%     6.13%  
6.50% senior notes due May 2018          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 600     $ 600  
Debt instrument, interest rate (as a percent) 6.50%     6.50%  
8.75% senior notes due May 2019          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 350     $ 350  
Debt instrument, interest rate (as a percent) 8.75%     8.75%  
2.60% senior notes due December 2019          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 500     $ 500  
Debt instrument, interest rate (as a percent) 2.60%     2.60%  
5.75% senior notes due January 2020          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 500     $ 500  
Debt instrument, interest rate (as a percent) 5.75%     5.75%  
5.00% senior notes due February 2021          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 600     $ 600  
Debt instrument, interest rate (as a percent) 5.00%     5.00%  
3.65% senior notes due June 2022          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 750     $ 750  
Debt instrument, interest rate (as a percent) 3.65%     3.65%  
2.85% senior notes due January 2023          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 400     $ 400  
Debt instrument, interest rate (as a percent) 2.85%     2.85%  
3.85% senior notes due October 2023          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 700     $ 700  
Debt instrument, interest rate (as a percent) 3.85%     3.85% 3.85%
3.60% senior notes due November 2024          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 750     $ 750  
Debt instrument, interest rate (as a percent) 3.60%     3.60%  
4.65% senior notes due October 2025          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 1,000        
Debt instrument, interest rate (as a percent) 4.65%        
6.70% senior notes due May 2036          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 250     $ 250  
Debt instrument, interest rate (as a percent) 6.70%     6.70%  
6.65% senior notes due January 2037          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 600     $ 600  
Debt instrument, interest rate (as a percent) 6.65%     6.65%  
5.15% senior notes due June 2042          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 500     $ 500  
Debt instrument, interest rate (as a percent) 5.15%     5.15%  
4.30% senior notes due January 2043          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 350     $ 350  
Debt instrument, interest rate (as a percent) 4.30%     4.30%  
4.70% senior notes due June 2044          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 700     $ 700  
Debt instrument, interest rate (as a percent) 4.70%     4.70%  
4.90% senior notes due February 2045          
Long-term debt:          
Long-term debt, before deducting unamortized discounts and debt issuance costs $ 650     $ 650  
Debt instrument, interest rate (as a percent) 4.90%     4.90%  
Other          
Short-term debt:          
Current portion of long-term notes and other debt $ 3     $ 3  
Long-term debt:          
Noncurrent portion of other long-term debt 5     5  
Commercial paper program          
Short-term debt:          
Short-term notes and borrowings $ 696     $ 734  
Weighted average interest rate, short-term (as a percent) 1.10%     0.46%  
Long-term debt:          
Noncurrent portion of other long-term debt $ 672        
Weighted average interest rate, long-term (as a percent) 1.10%        
Senior secured hedged inventory facility          
Short-term debt:          
Short-term notes and borrowings $ 300        
Weighted average interest rate, short-term (as a percent) 1.40%