Employee Benefit Plans - Subsequent Event (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 26, 2016	Sep. 30, 2016
Subsequent Event [Line Items]
Subsequent Event, Date		Oct. 12, 2016
Pension de-risking actions [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event, Description	As part of our long-term strategy to de-risk our defined benefit pension plans, we entered into an agreement to purchase a group annuity contract to transfer approximately $775 million of our outstanding pension benefit obligations related to certain U.S. retirees or beneficiaries, which was finalized on October 12, 2016. We have also offered certain former U.S. employees or beneficiaries with a vested pension benefit an option to take a one-time lump sum distribution in lieu of future monthly pension payments, which is expected to reduce our pension benefit obligations by approximately $995 million by the end of 2016. These transactions are expected to reduce the assets of our defined benefit pension plans by approximately $1.5 billion. As a result of these transactions, we expect to recognize a one-time pre-tax pension settlement charge in the range of $400 million to $530 million in the fourth quarter of 2016.
Defined Benefit Plan, Settlements, Plan Assets	$ 1,500
Purchase of Annuity Contract [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	775
Lump Sum Payments [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	995
Minimum [Member] | Pension de-risking actions [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Expected pre-tax settlement charge	(400)
Maximum [Member] | Pension de-risking actions [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Expected pre-tax settlement charge	$ (530)