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Financing arrangements (Contractual Maturities of Long-term Debt) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Disclosure [Abstract]  
2016 $ 2,250
2017 4,300
2018 2,075
2019 3,383
2020 1,950
Thereafter 17,682
Total $ 31,640