Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

Retirement Benefits [Abstract]

Net periodic benefit costs

The components of net periodic benefit costs were as follows:

	Three Months Ended June 30,
	2017						2016
	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
	(In millions)
Service costs	$	61		$	2		$	73		$	2
Interest costs	109			20			109			21
Curtailment costs (1)	—			—			—			(3		)
Expected return on plan assets	(130		)	(18		)	(127		)	(19		)
Amortization of net actuarial (gains) losses	48			—			50			2
Amortization of prior service costs (credit)	(1		)	(6		)	—			(1		)
Net periodic benefit costs (credit)	$	87		$	(2	)	$	105		$	2
	Six Months Ended June 30,
	2017						2016
	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
	(In millions)
Service costs	$	122		$	3		$	145		$	4
Interest costs	217			39			220			42
Curtailment costs (1)	—			—			—			27
Expected return on plan assets	(262		)	(36		)	(254		)	(37		)
Amortization of net actuarial (gains) losses	97			—			99			4
Amortization of prior service costs (credit)	(1		)	(11		)	—			(4		)
Net periodic benefit costs (credit)	$	173		$	(5	)	$	210		$	36

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(1) During the three months and six months ended June 30, 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.