Fair Value Measurements Other Segments Fair Value (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 1 [Member]		Dec. 31, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 1 [Member]		Sep. 30, 2014 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 2 [Member]		Dec. 31, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 2 [Member]		Sep. 30, 2014 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 3 [Member]		Dec. 31, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 3 [Member]		Sep. 30, 2014 Other Segments and Holding Company [Member] Recurring measurement [Member] Total fair value [Member]		Dec. 31, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Total fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 6	$ 7
Fair Value Of Property Plant And Equipment Impaired During Period	11	25
Assets [Abstract]
Marketable equity and debt securities			91		1		4		0		75		0		170		1
Trading securities			0		0		0		0		55		116		55		116
Derivative contracts, at fair value (asset)			0	[1]	0	[1]	64	[1]	1	[1]	0	[1]	0	[1]	64	[1]	1	[1]
Fair value of investment and derivative assets			91		1		68		1		130		116		289		118
Liabilities [Abstract]
Other liabilities			0		0		10		16		0		0		10		16
Derivative contracts at fair value (liability)			0	[2]	0	[2]	2	[2]	35	[2]	0	[2]	0	[2]	2	[2]	35	[2]
Fair value of derivative and other liabilities			$ 0		$ 0		$ 12		$ 51		$ 0		$ 0		$ 12		$ 51

[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.