Restructuring and Transaction Costs (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and transaction costs	$ 247
Employee Related Costs [Member] | Reduction Of Workforce [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and transaction costs	234
Accelerated Vesting Of Share-Based Grants For Employees [Member] | Reduction Of Workforce [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and transaction costs	67
Transaction Costs For Acquisition Closings [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and transaction costs	13
Estimated Defined Benefit Settlements [Member] | Reduction Of Workforce [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and transaction costs	$ 30