Other Income (Narrative) (Details) (USD $)	1 Months Ended	6 Months Ended		1 Months Ended	32 Months Ended
	Jun. 27, 2014	Jun. 27, 2014	Jun. 28, 2013	Feb. 28, 2013 Apex [Member]	Feb. 28, 2013 Apex [Member]
Proceeds from sale and maturity of marketable securities	$ 25,000,000
Marketable securities, realized gain (loss)	19,000,000
Marketable securities, after-tax realized gain (loss)	12,000,000
Marketable securities, realized gain, per diluted share	$ 0.02
Equity method investment, ownership percentage					50.00%
Proceeds from sale of unconsolidated joint venture				1,600,000,000
Total fair value of consideration received				797,000,000
Cash from sale of unconsolidated joint venture				759,000,000	759,000,000
Dividends received related to earnings of unconsolidated joint venture		0	66,600,000	67,000,000
Note receivable from sale of unconsolidated joint venture				38,000,000	38,000,000
Pre-tax gain on sale of unconsolidated joint venture				230,000,000
Equity method investment, after-tax realized gain (loss) on disposal				$ 144,000,000
Equity method investment realized gain on disposal per diluted share				$ 0.20