Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2010 Foreign Country [Member]	Dec. 31, 2011 Foreign Country [Member]	May 31, 2012 Foreign Country [Member]
Future Minimum Rental Payments
Operating leases minimum payments due in 2012	$ 291
Operating leases minimum payments due in 2013	198
Operating leases minimum payments due in 2014	131
Operating leases minimum payments due in 2015	106
Operating leases minimum payments due in 2016	86
Operating leases minimum payments due - Remainder	294
Total minimum rental payments under operating leases	1,106
Less minimum rentals to be received under operating leases	(41)
Net minimum rental payments under operating leases	1,065
Rental Expense
Minimum rental expense	523	485	519
Contingent rental expense	23	23	21
Total rental expense	546	508	540
Less sublease rental income	(2)	(3)	(4)
Net rental expense	544	505	536
Commitments and Contingencies (Textual)
Profit tax rate under new tax regime					0.07
Dividend tax rate under new tax regime					0.00%
Projected minimum annual prepayment of taxes						10
Payment made under the settlement				118
Gain on settlement of tax with GOA					30
Reduction to interest expense due to settlement					8
Income tax benefit on settlement					$ 20