Retirement Benefits Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Obligations and Funded Status

Pension and other postretirement benefit liabilities are accrued on an actuarial basis during the years an employee provides services.

The following table contains information at the dates indicated about the obligations and funded status of pension and other postretirement plans on a combined basis:

	December 31, 2016									December 31, 2015
	Pension Benefits									Pension Benefits
	Funded Plans			Unfunded Plans			Other Postretirement Benefits			Funded Plans			Unfunded Plans			Other Postretirement Benefits
Change in benefit obligation:
Benefit obligation at beginning of period	$	20		$	57		$	181		$	718		$	65		$	203
Interest cost	1			2			4			23			2			4
Amendments	—			—			—			—			—			—
Benefits paid, net	(1		)	(7		)	(21		)	(46		)	(8		)	(20		)
Actuarial (gain) loss and other	(2		)	(1		)	2			16			(2		)	(6		)
Settlements	—			—			—			(691		)	—			—
Benefit obligation at end of period	$	18		$	51		$	166		$	20		$	57		$	181
Change in plan assets:
Fair value of plan assets at beginning of period	$	15		$	—		$	261		$	598		$	—		$	272
Return on plan assets and other	(2		)	—			6			16			—			—
Employer contributions	—			—			10			138			—			9
Benefits paid, net	(1		)	—			(21		)	(46		)	—			(20		)
Settlements	—			—			—			(691		)	—			—
Fair value of plan assets at end of period	$	12		$	—		$	256		$	15		$	—		$	261
Amount underfunded (overfunded) at end of period	$	6		$	51		$	(90	)	$	5		$	57		$	(80	)
Amounts recognized in the consolidated balance sheets consist of:
Non-current assets	$	—		$	—		$	114		$	—		$	—		$	103
Current liabilities	—			(7		)	(2		)	—			(9		)	(2		)
Non-current liabilities	(6		)	(44		)	(23		)	(5		)	(48		)	(22		)
	$	(6	)	$	(51	)	$	89		$	(5	)	$	(57	)	$	79
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:
Net actuarial gain	$	—		$	—		$	(13	)	$	2		$	4		$	(18	)
Prior service cost	—			—			15			—			—			16
	$	—		$	—		$	2		$	2		$	4		$	(2	)

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]

The following table summarizes information at the dates indicated for plans with an accumulated benefit obligation in excess of plan assets:

	December 31, 2016						December 31, 2015
	Pension Benefits						Pension Benefits
	Funded Plans		Unfunded Plans		Other Postretirement Benefits		Funded Plans		Unfunded Plans		Other Postretirement Benefits
Projected benefit obligation	$	18	$	51	N/A		$	20	$	57	N/A
Accumulated benefit obligation	18		51		$	166	20		57		$	181
Fair value of plan assets	12		—		256		15		—		261

Schedule of Benefit Obligations Assumptions [Table Text Block]

Assumptions

The weighted-average assumptions used in determining benefit obligations at the dates indicated are shown in the table below:

	December 31, 2016				December 31, 2015
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Discount rate	3.65	%	2.34	%	3.59	%	2.38	%
Rate of compensation increase	N/A		N/A		N/A		N/A

Schedule or Description of Weighted Average Discount Rate [Table Text Block]

The weighted-average assumptions used in determining net periodic benefit cost for the periods presented are shown in the table below:

	December 31, 2016				December 31, 2015
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Discount rate	3.60	%	3.06	%	3.65	%	2.79	%
Expected return on assets:
Tax exempt accounts	3.50	%	7.00	%	7.50	%	7.00	%
Taxable accounts	N/A		4.50	%	N/A		4.50	%
Rate of compensation increase	N/A		N/A		N/A		N/A

Schedule of Health Care Cost Trend Rates [Table Text Block]

The assumed health care cost trend rates used to measure the expected cost of benefits covered by Panhandle’s and Sunoco, Inc.’s other postretirement benefit plans are shown in the table below:

	December 31,
	2016		2015
Health care cost trend rate	6.73	%	7.16	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.96	%	5.39	%
Year that the rate reaches the ultimate trend rate	2021		2018

Fair Value of Plan Assets [Table Text Block]

The fair value of the pension plan assets by asset category at the dates indicated is as follows:

			Fair Value Measurements at December 31, 2016
	Fair Value Total		Level 1		Level 2		Level 3
Asset Category:
Mutual funds (1)	$	12	$	12	$	—	$	—
Total	$	12	$	12	$	—	$	—

⁽¹⁾ Comprised of 100% equities as of December 31, 2016.

			Fair Value Measurements at December 31, 2015
	Fair Value Total		Level 1		Level 2		Level 3
Asset Category:
Mutual funds (1)	$	15	$	—	$	15	$	—
Total	$	15	$	—	$	15	$	—

⁽¹⁾  Comprised of 100% equities as of December 31, 2015.

The fair value of the other postretirement plan assets by asset category at the dates indicated is as follows:

			Fair Value Measurements at December 31, 2016
	Fair Value Total		Level 1		Level 2		Level 3
Asset Category:
Cash and Cash Equivalents	$	23	$	23	$	—	$	—
Mutual funds (1)	142		142		—		—
Fixed income securities	91		—		91		—
Total	$	256	$	165	$	91	$	—

⁽¹⁾ Primarily comprised of approximately 31% equities, 66% fixed income securities and 3% cash as of December 31, 2016.

			Fair Value Measurements at December 31, 2015
	Fair Value Total		Level 1		Level 2		Level 3
Asset Category:
Cash and Cash Equivalents	$	18	$	18	$	—	$	—
Mutual funds (1)	141		141		—		—
Fixed income securities	102		—		102		—
Total	$	261	$	159	$	102	$	—

⁽¹⁾  Primarily comprised of approximately 56% equities, 33% fixed income securities and 11% cash as of December 31, 2015.

The Level 1 plan assets are valued based on active market quotes.  The Level 2 plan assets are valued based on the net asset value per share (or its equivalent) of the investments, which was not determinable through publicly published sources but was calculated consistent with authoritative accounting guidelines.  

Schedule of Expected Benefit Payments [Table Text Block]

Benefit Payments

Panhandle’s and Sunoco, Inc.’s estimate of expected benefit payments, which reflect expected future service, as appropriate, in each of the next five years and in the aggregate for the five years thereafter are shown in the table below:

	Pension Benefits
Years	Funded Plans		Unfunded Plans		Other Postretirement Benefits (Gross, Before Medicare Part D)
2017	$	1	$	7	$	26
2018	1		7		25
2019	1		6		23
2020	1		6		22
2021	1		5		19
2022 – 2026	6		17		39

Schedule of Net Benefit Costs [Table Text Block]

Components of Net Periodic Benefit Cost

	December 31, 2016						December 31, 2015
	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Net Periodic Benefit Cost:
Interest cost	$	3		$	4		$	25		$	4
Expected return on plan assets	(1		)	(8		)	(16		)	(8		)
Prior service cost amortization	—			1			—			1
Actuarial loss amortization	—			—			—			—
Settlements	—			—			32			—
Net periodic benefit cost	$	2		$	(3	)	$	41		$	(3	)