Pensions and Other Postretirement Benefits (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans		$ 0	$ 0	$ 0	$ 250
Defined Benefit Plans, Net Periodic Benefit Cost, Estimated Future Employer Contributions In Current Fiscal Year		140		140
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans, Net Periodic Benefit Cost, Estimated Future Employer Contributions In Current Fiscal Year		75		75
Pension Annuitization [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions In Current And Next Fiscal Year				175
Minimum [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year				20
Maximum [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year				25
Voluntary Contribution [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans		0	0	0	21
Mandatory Contribution [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans		$ 7	$ 0	$ 13	$ 12
Scenario, Forecast [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan Settlements Benefit Obligation						$ 1,600
Scenario, Forecast [Member] | Minimum [Member] | Canadian Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans						5
Defined Benefit Plan Settlements Benefit Obligation						45
Scenario, Forecast [Member] | Minimum [Member] | Pension Annuitization [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncash Pension Settlement Charge - before tax	$ 800
Noncash Pension Settlement Charge - after tax	500
Scenario, Forecast [Member] | Maximum [Member] | Canadian Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to defined benefit pension plans						10
Defined Benefit Plan Settlements Benefit Obligation						$ 55
Scenario, Forecast [Member] | Maximum [Member] | Pension Annuitization [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncash Pension Settlement Charge - before tax	1,000
Noncash Pension Settlement Charge - after tax	$ 600