Fair Value Measurements and Guarantees (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended																																											3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Williams Partners [Member]	Jun. 30, 2013 Williams Partners [Member]	Jun. 30, 2014 Williams Partners [Member]	Jun. 30, 2013 Williams Partners [Member]	Jun. 30, 2014 Wpx Energy Inc [Member]	Jun. 30, 2014 Carrying Amount [Member]		Dec. 31, 2013 Carrying Amount [Member]		Jun. 30, 2014 Carrying Amount [Member] Former Venezuela Operations [Member]	Jun. 30, 2014 Fair Value [Member]		Dec. 31, 2013 Fair Value [Member]		Jun. 30, 2014 Fair Value [Member] Former Venezuela Operations [Member]	Jun. 30, 2014 Level 1 [Member]		Dec. 31, 2013 Level 1 [Member]		Jun. 30, 2014 Level 2 [Member]		Dec. 31, 2013 Level 2 [Member]		Jun. 30, 2014 Level 3 [Member]		Dec. 31, 2013 Level 3 [Member]		Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Williams Partners [Member]
Measured on a recurring basis:
ARO Trust investments																														$ 42	$ 33			$ 42	$ 33			$ 42	$ 33			$ 0	$ 0			$ 0	$ 0
Energy derivatives assets																																3	3			3	3			0	0			0	0			3	3
Energy derivative liabilities																																(2)	(3)			(2)	(3)			0	0			0	(1)			(2)	(2)
Additional disclosure:
Notes receivable and other								36		77			82		140			2		1		5		6		75		133
Long-term debt, including current portion								(16,289)	[1]	(11,353)	[1]		(17,684)	[1]	(11,971)	[1]		0	[1]	0	[1]	(17,684)	[1]	(11,971)	[1]	0	[1]	0	[1]
Guarantee								(31)		(32)			(28)		(29)			0		0		(28)		(29)		0		0
Fair Value, Level 1 to level 2 Transfers, Amount	0	0
Fair Value, Level 2 to level 1 Transfers, Amount	0	0
Notes Receivable, Fair Value Disclosure												29					75
Proceeds from Legal Settlements	42						42
Impairment of certain equipment held for sale			17	0	17	0																																												17
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax							7
Assets Held-for-sale, Long Lived, Fair Value Disclosure																																																		$ 46

[1] Excludes capital leases