Employee Benefit Plans - Schedule of Fair Value of Plan Assets Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	$ 227	$ 246
Common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	129	146
Corporate bonds (S&P rating of A or higher)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	15	16
Corporate bonds (S&P rating of lower than A)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	30	30
US Treasury and Government
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	40	38
Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	12	15
Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	1	1
Level 1
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 1 | Common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 1 | Corporate bonds (S&P rating of A or higher)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 1 | Corporate bonds (S&P rating of lower than A)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 1 | US Treasury and Government
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 1 | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 1 | Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	227	246
Level 2 | Common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	129	146
Level 2 | Corporate bonds (S&P rating of A or higher)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	15	16
Level 2 | Corporate bonds (S&P rating of lower than A)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	30	30
Level 2 | US Treasury and Government
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	40	38
Level 2 | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	12	15
Level 2 | Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	1	1
Level 3
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 3 | Common collective trusts
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 3 | Corporate bonds (S&P rating of A or higher)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 3 | Corporate bonds (S&P rating of lower than A)
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 3 | US Treasury and Government
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 3 | Mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	0	0
Level 3 | Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Assets at Fair Value	$ 0	$ 0