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Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Credit Facility $ 989   $ 0
Other 105   113
Capital lease obligations 167   0
Total debt 8,822   4,107
Less: Current portion of long-term debt (316)   (300)
Long-term debt, noncurrent 8,506   3,807
Series H Notes, interest rate of 6.2%, face amount of $289, matured June 15, 2016 (effective interest rate of 6.3%)      
Debt Instrument [Line Items]      
Senior notes 0   289
Series I Notes, interest rate of 6.4%, face amount of $293, maturing June 15, 2017 (effective interest rate of 6.5%)      
Debt Instrument [Line Items]      
Senior notes 293   293
Series K Notes, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%)      
Debt Instrument [Line Items]      
Senior notes 596   595
Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%)      
Debt Instrument [Line Items]      
Senior notes 348   348
Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%)      
Debt Instrument [Line Items]      
Senior notes 347   347
Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%)      
Debt Instrument [Line Items]      
Senior notes 396   395
Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%)      
Debt Instrument [Line Items]      
Senior notes 446   446
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)      
Debt Instrument [Line Items]      
Senior notes 344   343
Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%)      
Debt Instrument [Line Items]      
Senior notes 742   0
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)      
Debt Instrument [Line Items]      
Senior notes 742   0
2018 Senior Notes, interest rate of 6.8%, face amount $371, maturing May 15, 2018 (effective interest rate of 1.6%)      
Debt Instrument [Line Items]      
Senior notes 403   0
2019 Senior Notes, interest rate of 7.2%, face amount $210, maturing December 1, 2019 (effective interest rate of 2.2%)      
Debt Instrument [Line Items]      
Senior notes 245   0
2023 Senior Notes, interest rate of 3.1%, face amount $350, maturing February 15, 2023 (effective interest rate of 3.1%)      
Debt Instrument [Line Items]      
Senior notes 350   0
2025 Senior Notes, interest rate of 3.8%, face amount $350, maturing March 15, 2025 (effective interest rate of 2.8%)      
Debt Instrument [Line Items]      
Senior notes 375   0
2034 Senior Notes, interest rate of 4.5%, face amount $300, maturing October 1, 2034 (effective interest rate of 4.1%)      
Debt Instrument [Line Items]      
Senior notes $ 317   $ 0
Senior Notes | Series H Notes, interest rate of 6.2%, face amount of $289, matured June 15, 2016 (effective interest rate of 6.3%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate     6.20%
Senior notes, face amount     $ 289
Senior notes, effective interest rate     6.30%
Senior Notes | Series I Notes, interest rate of 6.4%, face amount of $293, maturing June 15, 2017 (effective interest rate of 6.5%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 6.40%   6.40%
Senior notes, face amount $ 293   $ 293
Senior notes, effective interest rate 6.50%   6.50%
Senior Notes | Series K Notes, interest rate of 3.0%, face amount of $600, maturing March 1, 2019 (effective interest rate of 4.4%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.00%   3.00%
Senior notes, face amount $ 600   $ 600
Senior notes, effective interest rate 4.40%   4.40%
Senior Notes | Series L Notes, interest rate of 3.3%, face amount of $350, maturing September 15, 2022 (effective interest rate of 3.4%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.30%   3.30%
Senior notes, face amount $ 350   $ 350
Senior notes, effective interest rate 3.40%   3.40%
Senior Notes | Series M Notes, interest rate of 3.4%, face amount of $350, maturing October 15, 2020 (effective interest rate of 3.6%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.40%   3.40%
Senior notes, face amount $ 350   $ 350
Senior notes, effective interest rate 3.60%   3.60%
Senior Notes | Series N Notes, interest rate of 3.1%, face amount of $400, maturing October 15, 2021 (effective interest rate of 3.4%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.10%   3.10%
Senior notes, face amount $ 400   $ 400
Senior notes, effective interest rate 3.40%   3.40%
Senior Notes | Series O Notes, interest rate of 2.9%, face amount of $450, maturing March 1, 2021 (effective interest rate of 3.1%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 2.90%   2.90%
Senior notes, face amount $ 450   $ 450
Senior notes, effective interest rate 3.10%   3.10%
Senior Notes | Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.80%   3.80%
Senior notes, face amount $ 350   $ 350
Senior notes, effective interest rate 4.00%   4.00%
Senior Notes | Series Q Notes, interest rate of 2.3%, face amount of $750, maturing January 15, 2022 (effective interest rate of 2.5%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 2.30% 2.30%  
Senior notes, face amount $ 750    
Senior notes, effective interest rate 2.50%    
Senior Notes | Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.10% 3.125%  
Senior notes, face amount $ 750    
Senior notes, effective interest rate 3.30%    
Senior Notes | 2018 Senior Notes, interest rate of 6.8%, face amount $371, maturing May 15, 2018 (effective interest rate of 1.6%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 6.80%    
Senior notes, face amount $ 371    
Senior notes, effective interest rate 1.60%    
Senior Notes | 2019 Senior Notes, interest rate of 7.2%, face amount $210, maturing December 1, 2019 (effective interest rate of 2.2%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 7.20%    
Senior notes, face amount $ 210    
Senior notes, effective interest rate 2.20%    
Senior Notes | 2023 Senior Notes, interest rate of 3.1%, face amount $350, maturing February 15, 2023 (effective interest rate of 3.1%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.10%    
Senior notes, face amount $ 350    
Senior notes, effective interest rate 3.10%    
Senior Notes | 2025 Senior Notes, interest rate of 3.8%, face amount $350, maturing March 15, 2025 (effective interest rate of 2.8%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.80%    
Senior notes, face amount $ 350    
Senior notes, effective interest rate 2.80%    
Senior Notes | 2034 Senior Notes, interest rate of 4.5%, face amount $300, maturing October 1, 2034 (effective interest rate of 4.1%)      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 4.50%    
Senior notes, face amount $ 300    
Senior notes, effective interest rate 4.10%    
Commercial Paper      
Debt Instrument [Line Items]      
Commercial paper $ 1,599   $ 938
Mortgages and Other      
Debt Instrument [Line Items]      
Mortgages and other $ 18   $ 0
Mortgages and Other | Maximum      
Debt Instrument [Line Items]      
Senior notes, stated interest rate 3.70%