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Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Weighted Average Assumptions Used in Calculating the Net Periodic Benefit Cost for Pension Plans and Other Postretirement Plans

Weighted Average Assumptions Used in Calculating the Benefit Obligations and the Net Amount Recognized

	Pension Benefits				Other Postretirement Benefits
	For the years ended December 31,
	2017		2016		2017		2016
Discount rate	3.73	%	4.22	%	3.55	%	3.97	%

Weighted Average Assumptions Used in Calculating the Net Periodic Benefit Cost for Pension Plans

	For the years ended December 31,
	2017		2016		2015
Discount rate	4.22	%	4.25	%	4.00	%
Expected long-term rate of return on plan assets	6.60	%	6.70	%	6.90	%

Weighted Average Assumptions Used in Calculating the Net Periodic Benefit Cost for Other Postretirement Plans

	For the years ended December 31,
	2017		2016		2015
Discount rate	3.97	%	4.00	%	3.75	%
Expected long-term rate of return on plan assets	6.60	%	6.60	%	6.90	%

Assumed Health Care Cost Trend Rates

Assumed Health Care Cost Trend Rates

	For the years ended December 31,
	2017		2016		2015
Pre-65 health care cost trend rate	6.75	%	6.90	%	7.30	%
Post-65 health care cost trend rate	N/A		N/A		5.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	5.00	%	5.00	%
Year that the rate reaches the ultimate trend rate	2028		2024		2023

Change in Benefit Obligation

Change in Benefit Obligation

	Pension Benefits						Other Postretirement Benefits
	For the years ended December 31,
	2017			2016			2017			2016
Benefit obligation — beginning of year	$	5,650		$	5,734		$	272		$	301
Service cost	4			2			—			—
Interest cost	170			237			8			11
Plan participants’ contributions	—			—			11			25
Actuarial loss	139			9			5			4
Settlements	(1,647		)	—			—			—
Plan Amendment	—			—			—			(1		)
Changes in assumptions	332			(30		)	10			—
Benefits and expenses paid	(273		)	(303		)	(51		)	(68		)
Retiree drug subsidy	—			—			1			—
Foreign exchange adjustment	1			1			—			—
Benefit obligation — end of year	$	4,376		$	5,650		$	256		$	272

Change in Plan Assets

Change in Plan Assets

	Pension Benefits						Other Postretirement Benefits
	For the years ended December 31,
	2017			2016			2017			2016
Fair value of plan assets — beginning of year	$	4,678		$	4,430		$	138		$	162
Actual return on plan assets	549			250			11			9
Employer contributions	280			301			—			—
Benefits paid [1]	(248		)	(279		)	(35		)	(33		)
Expenses paid	(21		)	(24		)	—			—
Settlements	(1,647		)	—			—			—
Foreign exchange adjustment	1			—			—			—
Fair value of plan assets — end of year	$	3,592		$	4,678		$	114		$	138
Funded status — end of year	$	(784	)	$	(972	)	$	(142	)	$	(134	)

[1] Other postretirement benefits paid represent non-key employee postretirement medical benefits paid from the Company's prefunded trust fund.

Defined Benefit Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets

Defined Benefit Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets

	As of December 31,
	2017			2016
Projected benefit obligation	$	4,376		$	5,650
Accumulated benefit obligation	4,376			5,650
Fair value of plan assets	3,592			4,678

Amounts Recognized in Consolidated Balance Sheets

Amounts Recognized in the Consolidated Balance Sheets

	Pension Benefits						Other Postretirement Benefits
	As of December 31,
	2017			2016			2017			2016
Other liabilities	$	784		$	972		$	142		$	134

Net Periodic Cost (Benefit)

Net Periodic Cost (Benefit)

	Pension Benefits									Other Postretirement Benefits
	For the years ended December 31,
	2017			2016			2015			2017			2016			2015
Service cost	$	4		$	2		$	2		$	—		$	—		$	—
Interest cost	170			237			235			8			11			12
Expected return on plan assets	(267		)	(311		)	(311		)	(8		)	(10		)	(12		)
Amortization of prior service credit	—			—			—			(7		)	(6		)	(7		)
Amortization of actuarial loss	56			56			60			5			5			5
Settlements	750			—			—			—			—			—
Net periodic cost (benefit)	$	713		$	(16	)	$	(14	)	$	(2	)	$	—		$	(2	)

Amounts Recognized in Other Comprehensive Income (Loss)

Amounts Recognized in Other Comprehensive Income (Loss)

	Pension Benefits						Other Postretirement Benefits
	For the years ended December 31,
	2017			2016			2017			2016
Amortization of actuarial loss	$	56		$	56		$	5		$	5
Settlement loss	750			—			—			—
Amortization of prior service credit	—			—			(7		)	(6		)
Net loss arising during the year	(209		)	(66		)	(12		)	(4		)
Total	$	597		$	(10	)	$	(14	)	$	(5	)

Amounts in Accumulated Other Comprehensive Income (Loss), Before Tax, not yet Recognized as Components of Net Periodic Benefit Cost

Amounts in Accumulated Other Comprehensive Income (Loss), Before Tax, not yet Recognized as Components of Net Periodic Benefit Cost

	Pension Benefits						Other Postretirement Benefits
	As of December 31,
	2017			2016			2017			2016
Net loss	$	(1,966	)	$	(2,563	)	$	(129	)	$	(122	)
Prior service credit	—			—			78			85
Total	$	(1,966	)	$	(2,563	)	$	(51	)	$	(37	)

Plan Assets

Other Postretirement Plan Assets at Fair Value as of December 31, 2017
Asset Category	Level 1			Level 2			Level 3			Total
Short-term investments	$	4		$	—		$	—		$	4
Fixed Income Securities:
Corporate	—			25			—			25
RMBS	—			17			—			17
U.S. Treasuries	1			25			—			26
Foreign government	—			1			—			1
CMBS	—			5			—			5
Other fixed income	—			4			1			5
Equity Securities:
Large-cap	30			—			—			30
Total other postretirement plan assets at fair value [1]	$	35		$	77		$	1		$	113

[1] Excludes approximately $0 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $1 of interest receivable.

Pension Plan Assets at Fair Value as of December 31, 2016

Asset Category	Level 1			Level 2			Level 3			Total
Short-term investments:	$	12		$	299		$	—		$	311
Fixed Income Securities:
Corporate	—			1,469			13			1,482
RMBS	—			266			10			276
U.S. Treasuries	69			649			4			722
Foreign government	—			37			1			38
CMBS	—			131			—			131
Other fixed income [1]	—			96			18			114
Mortgage Loans	—			—			121			121
Equity Securities:
Large-cap domestic	589			107			—			696
Mid-cap domestic	23			—			—			23
International	300			—			—			300
Total pension plan assets at fair value, in the fair value hierarchy [2]	$	993		$	3,054		$	167		$	4,214
Other Investments, at net asset value [3]:
Private Market Alternatives	—			—			—			87
Hedge funds	—			—			—			340
Total pension plan assets at fair value.	$	993		$	3,054		$	167		$	4,641

[1] Includes ABS,municipal bonds, and CDOs.

[2] Excludes approximately $2 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $39 of interest receivable.

[3] Investments that are measured at net asset value per share or an equivalent and have not been classified in the fair value hierarchy.

Other Postretirement Plan Assets at Fair Value as of December 31, 2016
Asset Category	Level 1			Level 2			Level 3			Total
Short-term investments	$	4		$	—		$	—		$	4
Fixed Income Securities:
Corporate	—			35			1			36
RMBS	—			24			1			25
U.S. Treasuries	5			14			—			19
Foreign government	—			2			—			2
CMBS	—			9			—			9
Other fixed income	—			4			1			5
Equity Securities:
Large-cap	37			—			—			37
Total other postretirement plan assets at fair value [1]	$	46		$	88		$	3		$	137

[1] Excludes approximately $1 of interest receivable carried at fair value.

Pension Plan Assets at Fair Value as of December 31, 2017

Asset Category	Level 1			Level 2			Level 3			Total
Short-term investments:	$	21		$	168		$	—		$	189
Fixed Income Securities:
Corporate	—			1,549			14			1,563
RMBS	—			28			2			30
U.S. Treasuries	3			74			—			77
Foreign government	—			16			1			17
CMBS	—			28			2			30
Other fixed income [1]	—			97			2			99
Mortgage Loans	—			—			140			140
Equity Securities:
Large-cap domestic	595			89			—			684
Mid-cap domestic	11			—			—			11
International	343			—			—			343
Total pension plan assets at fair value, in the fair value hierarchy [2]	$	973		$	2,049		$	161		$	3,183
Other Investments, at net asset value [3]:
Private Market Alternatives	—			—			—			168
Hedge funds	—			—			—			212
Total pension plan assets at fair value.	$	973		$	2,049		$	161		$	3,563

[1] Includes ABS, municipal bonds, and CDOs.

[2] Excludes approximately $1 of investment payables net of investment receivables that are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value. Also excludes approximately $30 of interest receivable.

[3] Investments that are measured at net asset value per share or an equivalent and have not been classified in the fair value hierarchy.

Target Asset Allocation

	Pension Plans				Other Postretirement Plans
	minimum		maximum		minimum		maximum
Equity securities	5	%	35	%	15	%	45	%
Fixed income securities	50	%	70	%	55	%	85	%
Alternative assets	—	%	45	%	—	%	—	%

Pension Plan Assets Fair Value Measurements Using Significant Unobservable Inputs

2016 Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets	Corporate			RMBS			Foreign government			Mortgage loans			Other [1]			Totals
Fair Value as of January 1, 2016	$	19		$	24		$	5		$	54		$	5		$	107
Realized gains,net	—			—			—			—			1			1
Changes in unrealized gains (losses), net	—			—			—			(3		)	—			(3		)
Purchases	15			—			—			70			24			109
Settlements	—			(14		)	—			—			(1		)	(15		)
Sales	(10		)	—			(4		)	—			(9		)	(23		)
Transfers into Level 3	—			2			—			—			3			5
Transfers out of Level 3	(11		)	(2		)	—			—			(1		)	(14		)
Fair Value as of December 31, 2016	$	13		$	10		$	1		$	121		$	22		$	167

[1]"Other" includes U.S. Treasuries and Other fixed income investments.

Other Postretirement Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets	Corporate			RMBS			Foreign Government			Other Fixed Income			Totals
Fair Value as of January 1, 2017	$	1		$	1		$	—		$	1		$	3
Changes in unrealized gains (losses), net	—			—			—			—			—
Purchases	1			—			—			1			2
Settlements	—			(1		)	—			—			(1		)
Sales	(2		)	—			—			—			(2		)
Transfers into Level 3	—			—			—			—			—
Transfers out of Level 3	—			—			—			(1		)	(1		)
Fair Value as of December 31, 2017	$	—		$	—		$	—		$	1		$	1

Other Postretirement Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets	Corporate			RMBS			Foreign Government			Other Fixed Income			Totals
Fair Value as of January 1, 2016	$	2		$	3		$	—		$	—		$	5
Changes in unrealized gains (losses), net	—			—			—			—			—
Purchases	1			—			—			1			2
Settlements	—			(2		)	—			—			(2		)
Sales	(1		)	—			—			—			(1		)
Transfers into Level 3	—			—			—			—			—
Transfers out of Level 3	(1		)	—			—			—			(1		)
Fair Value as of December 31, 2016	$	1		$	1		$	—		$	1		$	3

2017 Pension Plan Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets	Corporate			RMBS			Foreign government			Mortgage loans			Other [1]			Totals
Fair Value as of January 1, 2017	$	13		$	10		$	1		$	121		$	22		$	167
Realized gains,net	—			—			—			—			2			2
Changes in unrealized gains, net	2			—			—			2			2			6
Purchases	11			1			—			17			7			36
Settlements	—			(5		)	—			—			(1		)	(6		)
Sales	(12		)	(4		)	—			—			(19		)	(35		)
Transfers into Level 3	—			—			—			—			2			2
Transfers out of Level 3	—			—			—			—			(11		)	(11		)
Fair Value as of December 31, 2017	$	14		$	2		$	1		$	140		$	4		$	161

[1] "Other" includes U.S. Treasuries, Other fixed income and CMBS investments.

Company Contributions

Employer Contributions	Pension Benefits			Other Postretirement Benefits
2017	$	281		$	—
2016	$	301		$	—

Company Contributions

Company Contributions

Employer Contributions	Pension Benefits			Other Postretirement Benefits
2017	$	281		$	—
2016	$	301		$	—

Amounts of Benefits Expected to be Paid over the next Ten Years from Pension and other Postretirement Plans

Amounts of Benefits Expected to be Paid over the next Ten Years from Pension and other Postretirement Plans as of December 31, 2017

	Pension Benefits			Other Postretirement Benefits
2018	$	221		$	30
2019	237			27
2020	240			24
2021	247			22
2022	247			20
2023 - 2027	1,253			74
Total	$	2,445		$	197

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