Stockholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Stockholders' Equity Details [Abstract]
Dividends per common share (in dollars per share)		$ 0.12	$ 0.10	$ 0.24	$ 0.20
Dividends recorded on common stock		$ 74		$ 149	$ 132
Dividends recorded on unvested restricted share units		1
Dividends paid	73			155	135
Dividend declared, date paid				Jul. 01, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		(565)		(565)		(569)
Other comprehensive income (loss) before reclassifications				(18)
Reclassification from accumulated other comprehensive income (loss) to net earnings				22
Net other comprehensive income (loss)				4
Tax provision on net actuarial gain (loss) and prior service costs related to pension and other postretirement benefit plans				(14)
Continuing Operations [Member] | Cumulative Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		82		82		91
Other comprehensive income (loss) before reclassifications				(9)
Reclassification from accumulated other comprehensive income (loss) to net earnings				0
Net other comprehensive income (loss)				(9)
Continuing Operations [Member] | Net Actuarial Gain (Loss) and Prior Service Cost [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		(926)		(926)		(948)
Other comprehensive income (loss) before reclassifications				0
Reclassification from accumulated other comprehensive income (loss) to net earnings				22
Net other comprehensive income (loss)				22
Continuing Operations [Member] | Change in Fair Value of Cash Flow Hedge [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		(1)		(1)		0
Other comprehensive income (loss) before reclassifications				(1)
Reclassification from accumulated other comprehensive income (loss) to net earnings				0
Net other comprehensive income (loss)				(1)
Continuing Operations [Member] | Unrealized Gain (Loss) on Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		3		3		2
Other comprehensive income (loss) before reclassifications				1
Reclassification from accumulated other comprehensive income (loss) to net earnings				0
Net other comprehensive income (loss)				1
Discontinued Operations [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss)		277		277		286
Other comprehensive income (loss) before reclassifications				(9)
Reclassification from accumulated other comprehensive income (loss) to net earnings				0
Net other comprehensive income (loss)				(9)
Open Market Repurchase [Member]
Treasury Stock [Line Items]
Class B Common Stock repurchased under repurchase program (shares)		6.1		34.5
Value of shares repurchased		$ 296		$ 1,560
Average price per share repurchased (in dollars per share)		$ 48.33		$ 45.20
Accelerated Share Repurchase [Member]
Treasury Stock [Line Items]
ASR settlement		4.3