Debt Debt (Credit Facility) (Details) (Details)					12 Months Ended		12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 5b credit facility [Member]	Dec. 31, 2013 20b credit facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2013 United States of America, Dollars USD ($)	Dec. 31, 2013 JAPAN Revolving Credit Facility [Member] JPY (¥)	Dec. 31, 2013 JAPAN Japan, Yen
Line of Credit Facility [Line Items]
Ratio of Indebtedness to Net Capital				0.35
Ratio of Debt of Subsidiaries to Net Capital				10.00%
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,750,000,000	$ 0	¥ 5,000,000,000
Line of Credit Facility, Covenant Terms					194
Line of Credit Facility, Amount Outstanding	238,000,000				0
Debt Instrument, Interest Rate, Stated Percentage		1700.00%	1800.00%
Line of Credit Facility, Currency							20
Line Of Credit Facility Maximum Borrowing Capacity Available Support Letters Of Credit				250,000,000
Net Worth After Tax Effect				$ 14,900,000,000