Commitments, Contingencies and Other Items - Other Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 year	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Amount outstanding under letters of credit	$ 29	$ 31
Collateralized Financings	25	29
Payments under these right-of-way agreements	161	172	135
Rent expense, including common area maintenance, under non-cancelable lease agreements	311	308	232
Right-of-Way Agreements
Right-of-Way Agreements, 2013	119
Right-of-Way Agreements, 2014	61
Right-of-Way Agreements, 2015	56
Right-of-Way Agreements, 2016	50
Right-of-Way Agreements, 2017	49
Right-of-Way Agreements, Thereafter	365
Right-of-Way Agreements, Total	700
Facilities
Facilities, 2013	268
Facilities, 2014	238
Facilities, 2015	183
Facilities, 2016	162
Facilities, 2017	163
Facilities, Thereafter	553
Facilities, Total	1,567
Total
Right-of-Way Agreements and Facilities, 2013	387
Right-of-Way Agreements and Facilities, 2014	299
Right-of-Way Agreements and Facilities, 2015	239
Right-of-Way Agreements and Facilities, 2016	212
Right-of-Way Agreements and Facilities, 2017	212
Right-of-Way Agreements and Facilities, Thereafter	918
Right-of-Way Agreements and Facilities, Total	2,267
Future Minimum Sublease Receipts
2013	13
2014	9
2015	8
2016	6
2017	5
Thereafter	6
Total	$ 47
Period of Right-of-Way Agreements with cancelable agreements (in years)	1