Debt, Banking Arrangements, and Leases (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Long-Term Debt

	December 31,
	2014			2013
	(Millions)
Unsecured:
Transco:
6.4% Notes due 2016	$	200		$	200
6.05% Notes due 2018	250			250
7.08% Debentures due 2026	8			8
7.25% Debentures due 2026	200			200
5.4% Notes due 2041	375			375
4.45% Notes due 2042	400			400
Northwest Pipeline:
7% Notes due 2016	175			175
5.95% Notes due 2017	185			185
6.05% Notes due 2018	250			250
7.125% Debentures due 2025	85			85
Pre-merger WPZ:
3.8% Notes due 2015 (3)	750			750
7.25% Notes due 2017	600			600
5.25% Notes due 2020	1,500			1,500
4.125% Notes due 2020	600			600
4% Notes due 2021	500			500
3.35% Notes due 2022	750			750
4.5% Notes due 2023	600			600
4.3% Notes due 2024	1,000			—
3.9% Notes due 2025	750			—
6.3% Notes due 2040	1,250			1,250
5.8% Notes due 2043	400			400
5.4% Notes due 2044	500			—
4.9% Notes due 2045	500			—
ACMP (1):
5.875% Notes due 2021	750			—
6.125% Notes due 2022	750			—
4.875% Notes due 2023	1,400			—
4.875% Notes due 2024	750			—
Credit facility loans	640			—
The Williams Companies, Inc. (WMB):
7.875% Notes due 2021	371			371
3.7% Notes due 2023	850			850
4.55% Notes due 2024	1,250			—
7.5% Debentures due 2031	339			339
7.75% Notes due 2031	252			252
8.75% Notes due 2032	445			445
5.75% Notes due 2044	650			—
Various — 5.5% to 10.25% Notes and Debentures due 2019 to 2033	55			55
Credit facility loans	370			—
Capital lease obligations	5			1
Net unamortized debt premium (discount) (2)	187			(37		)
Total long-term debt, including current portion	20,892			11,354
Long-term debt due within one year	(4		)	(1		)
Long-term debt	$	20,888		$	11,353

________________

(1) See Note 2 – Acquisitions.

(2) Includes premium related to the fair value of ACMP debt. See Note 2 – Acquisitions.

(3) Presented as long-term debt due to the merged partnership’s intent and ability to refinance.

Schedule of Maturities of Long-term Debt [Table Text Block]

The following table presents aggregate minimum maturities of long-term debt, excluding net unamortized debt premium (discount) and capital lease obligations, for each of the next five years:

	December 31, 2014
	(Millions)
2015	$	—
2016	375
2017	785
2018	1,510
2019	32

Schedule of Line of Credit Facilities [Table Text Block]

Credit Facilities

	December 31, 2014
	Available		Outstanding
	(Millions)
Pre-merger WPZ credit facility (1)(3)
Loans	$	2,500	$	—
Letters of credit sub-limit	1,300		—
Letters of credit under certain bilateral bank agreements			1
ACMP credit facility (2)
Loans	1,750		640
Letters of credit sub-limit	200		2
Swing line advances sub-limit	100		—
WMB credit facility (1)
Loans	1,500		370
Letters of credit sub-limit	700		—
Letters of credit under certain bilateral bank agreements			15

________________

(1) Under certain conditions, the amount available may be increased up to an additional $500 million.

(2) Under certain conditions, the amount available may be increased up to an additional $250 million.

(3) Transco and Northwest Pipeline are each able to borrow up to $500 million under this credit facility to the extent not otherwise utilized by the other co-borrowers.

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

The future minimum annual rentals under noncancelable operating leases, are payable as follows:

	December 31, 2014
	(Millions)
2015	$	83
2016	71
2017	55
2018	41
2019	33
Thereafter	129
Total	$	412