Expenses (Activity Related To Restructuring-Related Accruals) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	$ 106
Additional accruals for Business Operations and Information Technology Transformation program	9
Payments and adjustments	(31)
Balance as of March 31, 2014	87
2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	3
Employee- Related Costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	50
Additional accruals for Business Operations and Information Technology Transformation program	6
Payments and adjustments	(17)
Balance as of March 31, 2014	39
Employee- Related Costs | 2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	0
Real Estate Consolidation
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	49
Additional accruals for Business Operations and Information Technology Transformation program	3
Payments and adjustments	(12)
Balance as of March 31, 2014	40
Real Estate Consolidation | 2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	0
Asset and Other Write-Offs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	7
Additional accruals for Business Operations and Information Technology Transformation program	0
Payments and adjustments	(2)
Balance as of March 31, 2014	8
Asset and Other Write-Offs | 2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	$ 3