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Financing arrangements (Debt Issuances) (Details) - USD ($)
 1 Months Ended 12 Months Ended
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]        
Aggregate principal amount of notes issued $ 3,500,000,000.0   $ 4,500,000,000.0 $ 8,100,000,000
Total debt issuance costs   $ 21,000,000 $ 18,000,000 $ 46,000,000
2.30% notes due 2016 (2.30% 2016 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   2.30% 2.30%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
2.50% notes due 2016 (2.50% 2016 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   2.50% 2.50%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
2.125% notes due 2017 (2.125% 2017 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   2.125% 2.125%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
1.25% notes due 2017 (1.25% 2017 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   1.25% 1.25%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.85% notes due 2017 (5.85% 2017 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.85% 5.85%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
6.15% notes due 2018 (6.15% 2018 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   6.15% 6.15%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
4.375% euro-denominated notes due 2018 (4.375% 2018 euro Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   4.375% 4.375%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.70% notes due 2019 (5.70% 2019 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.70% 5.70%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
2.20% notes due 2019 (2.20% 2019 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   2.20% 2.20%  
Redemption period without payment of a make-whole amount     1 month  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
2.125% euro-denominated notes due 2019 (2.125% 2019 euro Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   2.125% 2.125%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
4.50% notes due 2020 (4.50% 2020 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   4.50% 4.50%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
2.125% notes due 2020 (2.125% 2020 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note 2.125% 2.125%    
Redemption period without payment of a make-whole amount 1 month      
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
3.45% notes due 2020 (3.45% 2020 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   3.45% 3.45%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
4.10% notes due 2021 (4.10% 2021 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   4.10% 4.10% 4.10%
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
3.875% notes due 2021 (3.875% 2021 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   3.875% 3.875% 3.875%
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
2.70% notes due 2022 (2.70% 2022 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note 2.70% 2.70%    
Redemption period without payment of a make-whole amount 2 months      
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
3.625% notes due 2022 (3.625% 2022 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   3.625% 3.625% 3.625%
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
3.625% notes due 2024 (3.625% 2024 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   3.625% 3.625%  
Redemption period without payment of a make-whole amount     3 months  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
3.125% notes due 2025 (3.125% 2025 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note 3.125% 3.125%    
Redemption period without payment of a make-whole amount 3 months      
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.50% pound-sterling-denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.50% 5.50%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
4.00% pound-sterling-denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   4.00% 4.00%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
6.375% notes due 2037 (6.375% 2037 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   6.375% 6.375%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
6.90% notes due 2038 (6.90% 2038 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   6.90% 6.90%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
6.40% notes due 2039 (6.40% 2039 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   6.40% 6.40%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.75% notes due 2040 (5.75% 2040 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.75% 5.75%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
4.95% notes due 2041 (4.95% 2041 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   4.95% 4.95%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.15% notes due 2041 (5.15% 2041 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.15% 5.15%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.65% notes due 2042 (5.65% 2042 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.65% 5.65%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
5.375% notes due 2043 (5.375% 2043 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note   5.375% 5.375%  
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
4.40% notes due 2045 (4.40% 2045 Notes) [Member]        
Debt Instrument [Line Items]        
Stated contractual interest rate on note 4.40% 4.40%    
Redemption period without payment of a make-whole amount 6 months      
Redemption price as a percentage of the principal amount of notes that may be required to be paid in the event of a change in control triggering event   101.00%    
Floating rate notes due 2017 [Member] | Three-Month LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate     0.38%  
Floating rate notes due 2019 [Member] | Three-Month LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate     0.60%