Schedule II Valuation and Qualiying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	$ 3,393		$ 3,132		$ 3,113
Valuation Allowances and Reserves, Charged to Cost and Expense	(206)		60		(92)
Valuation Allowance Charged To Accumulated Other Comprehensive Income	(234)		191		204
Valuation Allowances and Reserves, Deductions	0		(4)		(82)
Valuation Allowances and Reserves, Adjustments	15		14		(11)
Valuation Allowances and Reserves, Ending Balance	2,968		3,393		3,132
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning Balance	99		97		106
Valuation Allowances and Reserves, Charged to Cost and Expense	18		20		14
Valuation Allowance Charged To Accumulated Other Comprehensive Income	0		0		0
Valuation Allowances and Reserves, Deductions	(20)	[1]	(20)	[1]	(19)	[1]
Valuation Allowances and Reserves, Adjustments	2		2		(4)
Valuation Allowances and Reserves, Ending Balance	$ 99		$ 99		$ 97

[1] Note: (a) Accounts receivable charged off.