Commitments and Contingencies Commitments and Other Contractual Obligations (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Operating leases, due 2012	$ 36
Operating leases, due 2013	132
Operating leases, due 2014	99
Operating leases, due 2015	84
Operating leases, due 2016	77
Operating leases, due thereafter	135
Operating leases	563
Inventory and related purchase obligations, due 2012	579
Inventory and related purchase obligations, due 2013	0
Inventory and related purchase obligations, due 2014	0
Inventory and related purchase obligations, due 2015	0
Inventory and related purchase obligations, due 2016	0
Inventory and related purchase obligations, due thereafter	0
Inventory and related purchase obligations	579
Other obligations, due 2012	111
Other obligations, due 2013	89
Other obligations, due 2014	72
Other obligations, due 2015	30
Other obligations, due 2016	23
Other obligations, due thereafter	3
Other obligations	328
Long-term debt and related interest, due 2012	14
Long-term debt and related interest, due 2013	340
Long-term debt and related interest, due 2014	35
Long-term debt and related interest, due 2015	436
Long-term debt and related interest, due 2016	26
Long-term debt and related interest, thereafter	1,102
Long-term debt and related interest	1,953
Commitments and other contractual obligations, due 2012	740
Commitments and other contractual obligations, due 2013	561
Commitments and other contractual obligations, due 2014	206
Commitments and other contractual obligations, due 2015	550
Commitments and other contractual obligations, due 2016	126
Commitments and other contractual obligations, due thereafter	1,240
Commitments and other contractual obligations	$ 3,423
Materials and services purchased, payment period	6 months