Income Taxes Income from continuing operations before income tax (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income before income taxes:
Income from continuing operations before income taxes	$ 1,538	$ 1,380	$ 1,388
Current:
Total current	404	455	235
Deferred:
Total deferred	(14)	(95)	143
Total income taxes expenses	390	360	378
U.K. [Member]
Income before income taxes:
Income from continuing operations before income taxes	96	36	222
Current:
Total current	(18)	(10)	13
Deferred:
Total deferred	43	46	32
U.S. [Member]
Income before income taxes:
Income from continuing operations before income taxes	349	468	305
Current:
Total current	111	170	(17)
Deferred:
Total deferred	(48)	(83)	109
U.S. state and local [Member]
Current:
Total current	52	57	35
Deferred:
Total deferred	10	(10)	14
Other [Member]
Income before income taxes:
Income from continuing operations before income taxes	1,093	876	861
Current:
Total current	259	238	204
Deferred:
Total deferred	$ (19)	$ (48)	$ (12)