Expenses (Activity Related To Restructuring-Related Accruals) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	$ 106
Additional accruals for Business Operations and Information Technology Transformation program	21
Payments and adjustments	(80)
Balance as of March 31, 2014	59
2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	12
Employee- Related Costs
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	50
Additional accruals for Business Operations and Information Technology Transformation program	14
Payments and adjustments	(37)
Balance as of March 31, 2014	28
Employee- Related Costs | 2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	1
Real Estate Consolidation
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2013	49
Additional accruals for Business Operations and Information Technology Transformation program	7
Payments and adjustments	(36)
Balance as of March 31, 2014	20
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	(7)
Balance as of March 31, 2014	11
Asset and Other Write-Offs | 2012 Expense Control Measures
Restructuring Reserve [Roll Forward]
Additional accruals for 2012 expense control measures	$ 11