Stockholders' Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Oct. 01, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Stockholders' Equity Disclosure [Abstract]
Dividends per common share (in dollars per share)		$ 0.12	$ 0.12	$ 0.36	$ 0.32
Dividends recorded on common stock		$ 73,000,000		$ 222,000,000	$ 210,000,000
Dividends recorded on unvested restricted share units		1,000,000
Dividends paid	72,000,000			228,000,000	199,000,000
Dividend declared, date paid				Oct. 01, 2013
Class B Common Stock repurchased under repurchase program (shares)		5.3		39.7
Value of shares repurchased		279,000,000		1,840,000,000
Average price per share repurchased (in dollars per share)		$ 53.2		$ 46.25
Remaining authorization under share repurchase program				5,790,000,000
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		(723,000,000)		(723,000,000)		(569,000,000)
Other comprehensive income (loss) before reclassifications				(9,000,000)
Reclassifications from accumulated other comprehensive income (loss) to net earnings				(145,000,000)
Net other comprehensive income (loss)				(154,000,000)
Tax provision on net actuarial gain (loss) and prior service costs related to pension and other postretirement benefit plans				19,000,000
Continuing Operations [Member] | Cumulative Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		189,000,000		189,000,000		192,000,000
Other comprehensive income (loss) before reclassifications				(3,000,000)
Reclassifications from accumulated other comprehensive income (loss) to net earnings				0
Net other comprehensive income (loss)				(3,000,000)
Continuing Operations [Member] | Net Actuarial Gain (Loss) and Prior Service Cost [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		(915,000,000)		(915,000,000)		(948,000,000)
Other comprehensive income (loss) before reclassifications				0
Reclassifications from accumulated other comprehensive income (loss) to net earnings				33,000,000
Net other comprehensive income (loss)				33,000,000
Continuing Operations [Member] | Unrealized Gain (Loss) on Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		3,000,000		3,000,000		2,000,000
Other comprehensive income (loss) before reclassifications				1,000,000
Reclassifications from accumulated other comprehensive income (loss) to net earnings				0
Net other comprehensive income (loss)				1,000,000
Discontinued Operations [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		0		0		185,000,000
Other comprehensive income (loss) before reclassifications		5,000,000	7,000,000	(7,000,000)	(17,000,000)
Reclassifications from accumulated other comprehensive income (loss) to net earnings		(178,000,000)	0	(178,000,000)	0
Net other comprehensive income (loss)				$ (185,000,000)