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Fair Value (Schedule of Carrying Values and Estimated Fair Values of Debt Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Feb. 03, 2017
Jul. 01, 2016
May 14, 2015
Dec. 02, 2014
May 28, 2014
Nov. 05, 2013
May 22, 2013
May 18, 2011
Debt Fair Value Disclosures                  
Debt issuance costs $ 44   $ 39            
Long-term debt, net of debt issuance costs $ 5,021   $ 4,091            
Senior Notes 3.75 Percent due November 2018 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 3.75%   3.75%       3.75%    
Senior Notes 7.00 Percent due November 2021 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent)     7.00%           7.00%
Senior Notes 4.250 Percent Due March 2022 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 4.25%   4.25%            
Senior Notes 4.75% Due June 2023 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 4.75%   4.75%            
Senior Notes 4.75 Percent Due June 2023 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent)               4.75%  
Senior Notes 4.875 Percent Due March 2024 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 4.875% 4.875% 4.875%            
Senior Notes 4.75 Percent Due January 2025 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 4.75%   4.75%     4.75%      
Senior Note 4.875 percent Due June 2027 [Domain]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 4.875%   4.875% 4.875%          
Senior note 5.75 percent due December 2034 [Member]                  
Debt Fair Value Disclosures                  
Stated interest rate (as a percent) 5.75%   5.75%   5.75%        
Carrying Amount [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings $ 5,065   $ 4,130            
Long-term debt, net of debt issuance costs 5,021   4,091            
Carrying Amount [Member] | Senior Notes 3.75 Percent due November 2018 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 710   800            
Carrying Amount [Member] | Senior Notes 7.00 Percent due November 2021 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 0   158            
Carrying Amount [Member] | Senior Notes 4.250 Percent Due March 2022 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 748   0            
Carrying Amount [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 951   990            
Carrying Amount [Member] | Senior Notes 4.875 Percent Due March 2024 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 497   0            
Carrying Amount [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 975   995            
Carrying Amount [Member] | Senior Note 4.875 percent Due June 2027 [Domain]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 695   698            
Carrying Amount [Member] | Senior note 5.75 percent due December 2034 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 489   489            
Estimate of Fair Value Measurement [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 5,159   3,491            
Long-term debt, net of debt issuance costs 5,159   3,491            
Estimate of Fair Value Measurement [Member] | Senior Notes 3.75 Percent due November 2018 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 726   804            
Estimate of Fair Value Measurement [Member] | Senior Notes 7.00 Percent due November 2021 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 0   164            
Estimate of Fair Value Measurement [Member] | Senior Notes 4.250 Percent Due March 2022 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 765   0            
Estimate of Fair Value Measurement [Member] | Senior Notes 4.75 Percent Due June 2023 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 987   857            
Estimate of Fair Value Measurement [Member] | Senior Notes 4.875 Percent Due March 2024 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 511   0            
Estimate of Fair Value Measurement [Member] | Senior Notes 4.75 Percent Due January 2025 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 984   795            
Estimate of Fair Value Measurement [Member] | Senior Note 4.875 percent Due June 2027 [Domain]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings 698   514            
Estimate of Fair Value Measurement [Member] | Senior note 5.75 percent due December 2034 [Member]                  
Debt Fair Value Disclosures                  
Current and noncurrent debt including short-term borrowings $ 488   $ 357