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Employee Benefits - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) trust shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total cost for retirement plans | $ 187 | $ 80 | $ 70
Settlement charge | 113 |  |
Defined contribution plan cost | 73 | 79 | 70
Pension trust assets | $ 1,960 | $ 1,987 |
Stock purchased by US plan under defined contribution plan (shares) | shares | 165,286 | 193,051 |
Stock sold by US plan under defined contribution plan (shares) | shares | 333,030 | 205,798 |
Stock held by the US plan under defined contribution plan (shares) | shares | 1,300,000 | 1,500,000 |
Market value of stock held by the US plan under defined contribution plan | $ 355 | $ 251 |
Dividend received by the plan | $ 3 | 3 |
United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 1,432 | 1,572 |
United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of pension trust accounts | trust | 1 |  |
Pension trust assets | $ 528 | 415 |
Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial gain (loss) to be recognized in net periodic pension cost | (15) |  |
Other components of net periodic benefit cost | (29) | (30) | (31)
Settlement charge | (85) | (4) | (7)
Expected required employer contribution | $ 11 |  |
Number of pension trust accounts | trust | 2 |  |
Pension trust assets | $ 1,960 | 1,987 | 2,219
Retirement Plans | United Kingdom Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Other components of net periodic benefit cost | (14) | (10) | (6)
Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial gain (loss) to be recognized in net periodic pension cost | 2 |  |
Prior service cost to be recognized in net periodic benefit cost | 1 |  |
Other components of net periodic benefit cost | (2) | (2) | (2)
Settlement charge | 0 | 0 | 0
Expected required employer contribution | 5 |  |
Pension trust assets | $ 13 | $ 16 | $ 20
Equity Securities, Domestic | United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 16.00% |  |
Equity Securities, International | United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 9.00% |  |
Debt Securities and Short-Term Investments | United States Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target plan asset allocations | 75.00% |  |
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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