Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Net periodic benefit costs

The components of net periodic benefit costs were as follows:

	Three Months Ended March 31,
	2017						2016
	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
	(In millions)
Service costs	$	61		$	1		$	72		$	2
Interest costs	108			19			111			21
Curtailment costs (1)	—			—			—			30
Expected return on plan assets	(132		)	(18		)	(127		)	(18		)
Amortization of net actuarial (gains) losses	49			—			49			2
Amortization of prior service costs (credit)	—			(5		)	—			(3		)
Net periodic benefit costs (credit)	$	86		$	(3	)	$	105		$	34

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(1) During the three months ended March 31, 2016, the Company recognized curtailment charges on certain postretirement benefit plans in connection with the sale to MassMutual. See Note 3 of the Notes to the Consolidated Financial Statements included in the 2016 Annual Report.