Contingencies and Other Matters - Legal and Regulatory Matters (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2014 Pending Litigation [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member]	Dec. 31, 2009 Unfavorable Regulatory Action [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member] Prior Claims [Member]	Mar. 31, 2013 Unfavorable Regulatory Action [Member] Current Claims [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 189
Loss Contingency Accrual At Carrying Value, Net Of Tax	123
Loss Contingency Accrual, Carrying Value, Payments			10
Loss Contingency Accrual, Carrying Value, Provision		77		48	29
Loss Contingency Accrual Carrying Value, Provision, After Tax		$ 51