Fair Value Measurements and Guarantees (Details) (USD $)	1 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended																																																3 Months Ended
	May 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Williams Partners [Member]	Sep. 30, 2013 Williams Partners [Member]	Sep. 30, 2014 Williams Partners [Member]	Sep. 30, 2013 Williams Partners [Member]	Jun. 30, 2014 Wpx Energy Inc [Member]	Sep. 30, 2014 Carrying Amount [Member]		Dec. 31, 2013 Carrying Amount [Member]		Sep. 30, 2014 Carrying Amount [Member] Former Venezuela Operations [Member]	Sep. 30, 2014 Fair Value [Member]		Dec. 31, 2013 Fair Value [Member]		Sep. 30, 2014 Fair Value [Member] Former Venezuela Operations [Member]	Sep. 30, 2014 Level 1 [Member]		Dec. 31, 2013 Level 1 [Member]		Sep. 30, 2014 Level 2 [Member]		Dec. 31, 2013 Level 2 [Member]		Sep. 30, 2014 Level 3 [Member]		Dec. 31, 2013 Level 3 [Member]		Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member]	Sep. 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]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Carrying Amount [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value [Member]	Sep. 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]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member]	Sep. 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]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 1 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Sep. 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]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Designated as Hedging Instrument [Member]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Sep. 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]	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Designated as Hedging Instrument [Member]	Jun. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Williams Partners [Member]	Sep. 30, 2014 Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member] Williams Partners [Member]
Measured on a recurring basis:
ARO Trust investments																															$ 42,000,000	$ 33,000,000				$ 42,000,000	$ 33,000,000				$ 42,000,000	$ 33,000,000				$ 0	$ 0				$ 0	$ 0
Energy derivatives assets																																	2,000,000	3,000,000	1,000,000			2,000,000	3,000,000	1,000,000			0	0	0			0	0	1,000,000			2,000,000	3,000,000	0
Energy derivative liabilities																																	(3,000,000)	(3,000,000)				(3,000,000)	(3,000,000)				0	0				(1,000,000)	(1,000,000)				(2,000,000)	(2,000,000)
Additional disclosure:
Notes receivable and other									30,000,000		77,000,000			70,000,000		140,000,000			1,000,000		1,000,000		4,000,000		6,000,000		65,000,000		133,000,000
Long-term debt, including current portion									(20,669,000,000)	[1]	(11,353,000,000)	[1]		(21,598,000,000)	[1]	(11,971,000,000)	[1]		0	[1]	0	[1]	(21,598,000,000)	[1]	(11,971,000,000)	[1]	0	[1]	0	[1]
Guarantee									(31,000,000)		(32,000,000)			(28,000,000)		(29,000,000)			0		0		(28,000,000)		(29,000,000)		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													25,000,000					65,000,000
Proceeds from Legal Settlements	42,000,000							42,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax								7,000,000
Assets Held-for-sale, Long Lived, Fair Value Disclosure																																																									44,000,000
Impairment of certain equipment held for sale				$ 0	$ 0	$ 17,000,000	$ 0																																																	$ 17,000,000

[1] Excludes capital leases