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Benefit Plans (Expected Future Benefit Payments) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
U.S. Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contribution in 2016 $ 22
Expected benefit payments for fiscal year ending:  
2015 65
2016 67
2017 69
2018 71
2019 73
2021 - 2025 380
Foreign Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Expected employer contribution in 2016 100
Expected benefit payments for fiscal year ending:  
2015 268
2016 277
2017 289
2018 299
2019 309
2021 - 2025 $ 1,686