Other Assets (Details 3) $ in Millions	Dec. 31, 2015 USD ($)
Estimated amortization expense for other intangible assets
Estimated amortization expense, 2016	$ 174
Estimated amortization expense, 2017	156
Estimated amortization expense, 2018	146
Estimated amortization expense, 2019	106
Estimated amortization expense, 2020	$ 76