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Segment Information - Schedule of Information Concerning Principal Geographic Areas (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Information concerning principal geographic areas                      
Revenues $ 2,964 $ 2,920 $ 2,872 $ 2,695 $ 2,883 $ 2,792 $ 2,837 $ 2,640 $ 11,451 $ 11,152 $ 10,809
Long-Lived Assets 21,716       22,296       21,716 22,296 22,979
United States                      
Information concerning principal geographic areas                      
Revenues                 9,795 9,428 9,145
Long-Lived Assets 19,400       19,708       19,400 19,708 20,020
International                      
Information concerning principal geographic areas                      
Revenues                 1,656 1,724 1,664
Long-Lived Assets $ 2,316       $ 2,588       $ 2,316 $ 2,588 $ 2,959