Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2014

Compensation and Retirement Disclosure [Abstract]

Funded Status of Pension and Other Postretirement Benefit Plans

The funded status of the pension and other postretirement benefit plans at December 31, 2014 and 2013 was as follows:

	Pension Benefits						Other Postretirement Benefits
	2014			2013			2014			2013
	(in millions)
Benefit obligation, beginning of year	$	2,777		$	2,894		$	394		$	470
Service cost		86			95			10			13
Interest cost		140			125			19			19
Actuarial loss (gain)		536			(261	)		74			(97	)
Benefits paid		(85	)		(75	)		(10	)		(11	)
Foreign currency translation effect		(19	)		(1	)		(2	)		—
Benefit obligation, end of year		3,435			2,777			485			394
Plan assets at fair value, beginning of year		2,717			2,305			130			96
Actual return on plan assets		240			409			12			27
Employer contributions		92			82			11			18
Benefits paid		(85	)		(75	)		(10	)		(11	)
Foreign currency translation effect		(18	)		(4	)		—			—
Plan assets at fair value, end of year		2,946			2,717			143			130
Funded status at end of year, included in other liabilities	$	489		$	60		$	342		$	264

Net Actuarial Loss (Gain) and Prior Service Cost Included in Accumulated Other Comprehensive Income

Net actuarial loss (gain) and prior service cost included in accumulated other comprehensive income that were not yet recognized as components of net benefit costs at December 31, 2014 and 2013 were as follows:

	Pension Benefits				Other Postretirement Benefits
	2014		2013		2014		2013
	(in millions)
Net actuarial loss (gain)	$	842	$	396	$	58	$	(13	)
Prior service cost		14		16		1		1
	$	856	$	412	$	59	$	(12	)

Weighted Average Assumptions Used to Determine Benefit Obligations

The weighted average assumptions used to determine the benefit obligations were as follows:

	Pension Benefits						Other Postretirement Benefits
	2014			2013			2014			2013
Discount rate		4.3	%		5.2	%		4.3	%		5.2	%
Rate of compensation increase		4.5			4.5			—			—

Components of Net Pension and Other Postretirement Benefit Costs Reflected in Net Income

The components of net pension and other postretirement benefit costs reflected in net income and other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2014, 2013 and 2012 were as follows:

	Pension Benefits									Other Postretirement Benefits
	2014			2013			2012			2014			2013			2012
	(in millions)
Costs reflected in net income
Service cost	$	86		$	95		$	88		$	10		$	13		$	12
Interest cost		140			125			124			19			19			20
Expected return on plan assets		(186	)		(165	)		(155	)		(9	)		(7	)		(6	)
Amortization of net actuarial loss and prior service cost and other		35			90			80			—			3			3
	$	75		$	145		$	137		$	20		$	28		$	29

Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income

The components of net pension and other postretirement benefit costs reflected in net income and other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2014, 2013 and 2012 were as follows:

	Pension Benefits									Other Postretirement Benefits
	2014			2013			2012			2014			2013			2012
	(in millions)
Costs reflected in net income
Service cost	$	86		$	95		$	88		$	10		$	13		$	12
Interest cost		140			125			124			19			19			20
Expected return on plan assets		(186	)		(165	)		(155	)		(9	)		(7	)		(6	)
Amortization of net actuarial loss and prior service cost and other		35			90			80			—			3			3
	$	75		$	145		$	137		$	20		$	28		$	29
Changes in plan assets and benefit obligations recognized in other comprehensive income
Net actuarial loss (gain)	$	479		$	(505	)	$	139		$	71		$	(117	)	$	(11	)
Amortization of net actuarial loss and prior service cost and other		(35	)		(90	)		(80	)		—			(3	)		(3	)
	$	444		$	(595	)	$	59		$	71		$	(120	)	$	(14	)

Weighted Average Assumptions Used to Determine Net Pension and Other Postretirement Benefit Costs

The weighted average assumptions used to determine net pension and other postretirement benefit costs were as follows:

	Pension Benefits						Other Postretirement Benefits
	2014		2013		2012		2014		2013		2012
Discount rate		5.2%		4.4%		5.0%		5.2%		4.4%		5.0%
Rate of compensation increase		4.5		4.5		4.5		—		—		—
Expected long term rate of return on plan assets		7.5		7.5		7.75		7.5		7.5		7.75

Weighted Average Health Care Cost Trend Rate Assumptions

The weighted average health care cost trend rate assumptions used to measure the expected cost of medical benefits were as follows:

	December 31
	2014			2013
Health care cost trend rate for next year		7.3	%		7.6	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		4.5			4.5
Year that the rate reaches the ultimate trend rate		2028			2028

Fair Values of Pension Plan Assets

The fair values of the pension plan assets were as follows:

	December 31
	2014		2013
	(in millions)
Short term investments	$	48	$	37
Fixed maturities
U.S. government and government agency and authority obligations		209		224
Corporate bonds		419		371
Foreign government and government agency obligations		137		104
Mortgage-backed securities		228		217
Total fixed maturities		993		916
Equity securities		1,850		1,718
Other assets		55		46
	$	2,946	$	2,717

Estimated Benefits Expected to be Paid

The estimated benefits expected to be paid in each of the next five years and in the aggregate for the following five years are as follows:

Years Ending December 31	Pension Benefits		Other Postretirement Benefits
	(in millions)
2015	$	105	$	12
2016		115		14
2017		151		15
2018		132		17
2019		143		18
2020-2024		868		117