Expenses (Activity Related To Restructuring-Related Accruals) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	$ 106
Additional accruals for Business Operations and Information Technology Transformation program	19
Payments and adjustments	(59)
Balance as of March 31, 2014	72
2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	6
Employee- Related Costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	50
Additional accruals for Business Operations and Information Technology Transformation program	16
Payments and adjustments	(26)
Balance as of March 31, 2014	40
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	(29)
Balance as of March 31, 2014	23
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	(4)
Balance as of March 31, 2014	9
Asset and Other Write-Offs | 2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	$ 6