Business Segments - Schedule of Revenue from External Customers by Geographic Area (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2014
|
Sep. 30, 2014
|
Jun. 30, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
Revenue from External Customer [Line Items] | |||||||||||
Total revenues | $ 2,828 | $ 2,644 | $ 2,667 | $ 2,363 | $ 2,643 | $ 2,449 | $ 2,380 | $ 2,263 | $ 10,502 | $ 9,735 | $ 9,276 |
United States [member] | |||||||||||
Revenue from External Customer [Line Items] | |||||||||||
Total revenues | 7,927 | 7,262 | 6,743 | ||||||||
Rest of World [member] | |||||||||||
Revenue from External Customer [Line Items] | |||||||||||
Total revenues | $ 2,575 | $ 2,473 | $ 2,533 |