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Retirement Plans and Other Retiree Benefits - Allocation of Plan Assets and Level of Valuation Input, by Major Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Percent of fixed income assets invested in US treasury or agency securities 50.00% 50.00%  
Other Retiree Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0 $ 14
Fair value of plan assets, excluding NAV investments 0 0  
NAV investments 0 0  
Other Retiree Benefit Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | U.S. common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | International common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Pooled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Domestic, developed and emerging markets equity funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 0 0  
Other Retiree Benefit Plans | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 0 0  
Other Retiree Benefit Plans | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 0 0  
Other Retiree Benefit Plans | Multi-Asset funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 0 0  
Other Retiree Benefit Plans | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 0 0  
Other Retiree Benefit Plans | Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,812 1,646 1,624
Fair value of plan assets, excluding NAV investments 1,130 1,056  
NAV investments 707 632  
United States | Pension Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21 27  
United States | Pension Plans | U.S. common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 127 127  
United States | Pension Plans | International common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Pension Plans | Pooled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 138 134  
United States | Pension Plans | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 843 767  
United States | Pension Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
United States | Pension Plans | Domestic, developed and emerging markets equity funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 350 323  
United States | Pension Plans | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 122 118  
United States | Pension Plans | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 82 96  
United States | Pension Plans | Multi-Asset funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 115 52  
United States | Pension Plans | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 38 43  
United States | Pension Plans | Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (25) (42)  
International | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 575 509 $ 520
Fair value of plan assets, excluding NAV investments 189 174  
NAV investments 386 335  
International | Pension Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11 13  
International | Pension Plans | U.S. common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 3  
International | Pension Plans | International common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 3  
International | Pension Plans | Pooled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 94 84  
International | Pension Plans | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 24 22  
International | Pension Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 53 49  
International | Pension Plans | Domestic, developed and emerging markets equity funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 189 155  
International | Pension Plans | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 167 155  
International | Pension Plans | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 5 3  
International | Pension Plans | Multi-Asset funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 3 3  
International | Pension Plans | Real estate funds      
Defined Benefit Plan Disclosure [Line Items]      
NAV investments 22 19  
International | Pension Plans | Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0