Investments in, Earnings from and Transactions with Unconsolidated Affiliates (Table 1) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Investment	$ 2,756		$ 2,756		$ 1,673
Earnings (losses) from unconsolidated affiliates	36	28	98	167
Ruby [Member]
Schedule of Equity Method Investments [Line Items]
Investment	1,069		1,069
Earnings (losses) from unconsolidated affiliates	(1)		(1)
Four Star [Member]
Schedule of Equity Method Investments [Line Items]
Investment	351		351		393
Earnings (losses) from unconsolidated affiliates	(3)	(2)	(4)	(3)
Citrus [Member]
Schedule of Equity Method Investments [Line Items]
Investment	897		897		822
Earnings (losses) from unconsolidated affiliates	25	27	74	67
Gulf LNG [Member]
Schedule of Equity Method Investments [Line Items]
Investment	237		237		266
Earnings (losses) from unconsolidated affiliates	(1)	(1)	(1)	(1)
Bolivia-to-Brazil Pipeline [Member]
Schedule of Equity Method Investments [Line Items]
Investment	108		108		104
Earnings (losses) from unconsolidated affiliates	10	1	13	10
Other [Member]
Schedule of Equity Method Investments [Line Items]
Investment	94		94		88
Earnings (losses) from unconsolidated affiliates	$ 6	$ 3	$ 17	$ 94