Fair Value Measurements Other Segments Fair Value (Details) (USD $) In Millions, unless otherwise specified																	6 Months Ended
	Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 1 [Member]		Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 1 [Member]		Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 2 [Member]		Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 2 [Member]		Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 3 [Member]		Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 3 [Member]		Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Total fair value [Member]		Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Total fair value [Member]		Jun. 30, 2013 Property, plant and equipment	Jun. 30, 2012 Property, plant and equipment	Jun. 30, 2013 Intangible assets	Jun. 30, 2012 Intangible assets
Assets [Abstract]
Marketable equity and debt securities	$ 22		$ 1		$ 0		$ 0		$ 0		$ 0		$ 22		$ 1
Trading securities	0		0		0		0		114		60		114		60
Derivative contracts, at fair value (asset)	0	[1]	0	[1]	71	[1]	1	[1]	0	[1]	21	[1]	71	[1]	22	[1]
Fair value of investment and derivative assets	22		1		71		1		114		81		207		83
Fair Value of Level 3 Asset																	23	29	0	62
Recognized Impairment																	5	19	0	15
Liabilities [Abstract]
Other liabilities	0		0		43		1		0		0		43		1
Derivative contracts at fair value (liability)	0	[2]	0	[2]	12	[2]	89	[2]	0	[2]	0	[2]	12	[2]	89	[2]
Fair value of derivative and other liabilities	$ 0		$ 0		$ 55		$ 90		$ 0		$ 0		$ 55		$ 90

[1] Amounts are classified within other assets in our consolidated balance sheets.

[2] Amounts are classified within accrued expenses and other liabilities in our consolidated balance sheets.