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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Aug. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Feb. 29, 2016
Dec. 31, 2015
Debt Instrument [Line Items]            
Unamortized bond discounts, premiums and issuance costs, net   $ (942)       $ (210)
Total carrying value of debt   35,323       31,429
Less current portion   (4,797)       (2,247)
Total noncurrent debt   30,526       29,182
Notes [Member]            
Debt Instrument [Line Items]            
Unamortized bond discounts, premiums and issuance costs, net     $ (801)      
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event 101.00%          
Notes [Member] | 2.30% notes due 2016 (2.30% 2016 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 0       $ 750
Interest rate, stated percentage   2.30%       2.30%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.50% notes due 2016 (2.50% 2016 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,000       $ 1,000
Interest rate, stated percentage   2.50%       2.50%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.125% notes due 2017 (2.125% 2017 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,250       $ 1,250
Interest rate, stated percentage   2.125%       2.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | Floating Rate Notes due 2017 [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 600       $ 600
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 1.25% notes due 2017 (1.25% 2017 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 850       $ 850
Interest rate, stated percentage   1.25%       1.25%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.85% notes due 2017 (5.85% 2017 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,100       $ 1,100
Interest rate, stated percentage   5.85%       5.85%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 6.15% notes due 2018 (6.15% 2018 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 500       $ 500
Interest rate, stated percentage   6.15%       6.15%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.375% euro-denominated notes due 2018 (4.375% 2018 euro Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 616       $ 599
Interest rate, stated percentage   4.375%       4.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.70% notes due 2019 (5.70% 2019 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,000       $ 1,000
Interest rate, stated percentage   5.70%       5.70%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | Floating Rate Notes due 2019 [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 250       $ 250
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,400       $ 1,400
Interest rate, stated percentage   2.20%       2.20%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.125% euro-denominated notes due 2019 (2.125% 2019 euro Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 758       $ 733
Interest rate, stated percentage   2.125%       2.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 300       $ 300
Interest rate, stated percentage   4.50%       4.50%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 750       $ 750
Interest rate, stated percentage   2.125%       2.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 900       $ 900
Interest rate, stated percentage   3.45%       3.45%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,000       $ 1,000
Interest rate, stated percentage   4.10%       4.10%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 750       $ 0
Interest rate, stated percentage 1.85% 1.85%        
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,750       $ 1,750
Interest rate, stated percentage   3.875%       3.875%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 1.25% euro-denominated notes due 2022 (1.25% 2022 euro Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,404        
Interest rate, stated percentage   1.25%     1.25%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.70% notes due 2022 (2.70% 2022 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 500       $ 500
Interest rate, stated percentage   2.70%       2.70%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 750       $ 750
Interest rate, stated percentage   3.625%       3.625%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.25% notes due 2023 (2.25% 2023 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 750       $ 0
Interest rate, stated percentage 2.25% 2.25%        
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,400       $ 1,400
Interest rate, stated percentage   3.625%       3.625%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,000       $ 1,000
Interest rate, stated percentage   3.125%       3.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.00% euro-denominated notes due 2026 (2.00% 2026 euro Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 843        
Interest rate, stated percentage   2.00%     2.00%  
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,250       $ 0
Interest rate, stated percentage 2.60% 2.60%        
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.50% pound-sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 616       $ 700
Interest rate, stated percentage   5.50%       5.50%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.00% pound-sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 908       $ 1,032
Interest rate, stated percentage   4.00%       4.00%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 6.375% notes due 2037 (6.375% 2037 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 552       $ 900
Interest rate, stated percentage   6.375%       6.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 6.90% notes due 2038 (6.90% 2038 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 291       $ 500
Interest rate, stated percentage   6.90%       6.90%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 6.40% notes due 2039 (6.40% 2039 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 466       $ 1,000
Interest rate, stated percentage   6.40%       6.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.75% notes due 2040 (5.75% 2040 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 412       $ 700
Interest rate, stated percentage   5.75%       5.75%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.95% notes due 2041 (4.95% 2041 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 600       $ 600
Interest rate, stated percentage   4.95%       4.95%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.15% notes due 2041 (5.15% 2041 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 974       $ 2,250
Interest rate, stated percentage   5.15%       5.15%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.65% notes due 2042 (5.65% 2042 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 487       $ 1,250
Interest rate, stated percentage   5.65%       5.65%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 5.375% notes due 2043 (5.375% 2043 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 261       $ 1,000
Interest rate, stated percentage   5.375%       5.375%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 2,250       $ 1,250
Interest rate, stated percentage 4.40% 4.40%       4.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 1,415        
Interest rate, stated percentage   4.563% 4.563%      
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 3,541        
Interest rate, stated percentage   4.663% 4.663%      
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Term Loan [Member] | Term Loan due 2018 [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 0       $ 1,975
Bonds [Member] | 0.41% Swiss-franc-denominated bonds due 2023 (0.41% 2023 Swiss franc Bonds) [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 721        
Interest rate, stated percentage   0.41%   0.41%    
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event   101.00%        
Other Notes [Member]            
Debt Instrument [Line Items]            
Long-term borrowings   $ 100       $ 100