Short-Term Borrowings (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 CAD	Dec. 31, 2012 USD ($)
Debt Disclosure [Abstract]
Commercial paper authorized	$ 3,000,000,000
Commercial paper maturity period (in days)	270 days
Weighted-average interest rate of short-term borrowings	0.48%		0.55%
Average balances of securities purchased under agreements to resell and securities sold under agreements to repurchase	28,250,000,000		21,290,000,000
Maximum borrowing capacity	753,000,000	800,000,000
Amount outstanding	$ 0