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Other Assets (Details 2) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Components of other intangible assets    
Gross Carrying Amount $ 1,885 $ 1,737
Accumulated Amortization (1,017) (941)
Net Carrying Amount 868 796
Customer Relationships [Member]    
Components of other intangible assets    
Gross Carrying Amount 1,625 1,506
Accumulated Amortization (895) (836)
Net Carrying Amount 730 670
Other Contracts [Member]    
Components of other intangible assets    
Gross Carrying Amount 260 231
Accumulated Amortization (122) (105)
Net Carrying Amount $ 138 $ 126