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Employee Benefits - Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) trust shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total cost for retirement plans | $ 70,000,000 | $ 69,000,000 | $ 91,000,000
Defined contribution plan cost | 70,000,000 | 65,000,000 | 67,000,000
Pension trust assets | $ 2,219,000,000 | $ 2,073,000,000 |
Shares purchased by US plan under defined contribution plan | shares | 228,248 | 216,035 |
Shares sold by US plan under defined contribution plan | shares | 297,750 | 437,283 |
Shares held by the US plan under defined contribution plan | shares | 1,500,000 | 1,600,000 |
Shares held by the US plan under defined contribution plan, market value | $ 255,000,000 | $ 171,000,000 |
Dividend received by the plan | $ 3,000,000 | 2,000,000 |
United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 1,739,000,000 | 1,632,000,000 |
United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net periodic benefit cost (credit) | $ (6,000,000) | (10,000,000) | (10,000,000)
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 480,000,000 | 441,000,000 |
Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss to be recognized in net periodic pension cost | 19,000,000 |  |
Prior service cost to be recognized in net periodic benefit cost | 0 |  |
Net periodic benefit cost (credit) | (23,000,000) | (25,000,000) | (5,000,000)
Expected required employer contribution | $ 9,000,000 |  |
Number of pension trust accounts | trust | 2 |  |
Pension trust assets | $ 2,219,000,000 | 2,073,000,000 | 2,023,000,000
Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss to be recognized in net periodic pension cost | 0 |  |
Prior service cost to be recognized in net periodic benefit cost | 0 |  |
Net periodic benefit cost (credit) | (2,000,000) | 1,000,000 | 2,000,000
Expected required employer contribution | 7,000,000 |  |
Pension trust assets | $ 20,000,000 | $ 0 | $ 0
Equity Securities, Domestic | United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 27.00% |  |
Equity Securities, International | United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 5.00% |  |
Debt Securities and Short-Term Investments | United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 68.00% |  |
Equity Securities | United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 20.00% |  |
Diversified Growth Funds | United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 30.00% |  |
Fixed Income Funds | United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 40.00% |  |
Real estate funds | United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 10.00% |  |

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