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Pension and Other Postretirement Benefits (Schedule of Reconciliation of Plan Assets Measured by Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | $ 96 | $ 57
Balance at end of period |  | 96
Fair Value Measured at Net Asset Value Per Share | Investment Funds Emerging Markets [Member] |  |
Plan Assets |  |
Balance at beginning of period | 23 | 20
Balance at end of period |  | 23
Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 328 | 282
Balance at end of period |  | 328
Fair Value Measured at Net Asset Value Per Share | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 193 | 210
Balance at end of period |  | 193
Level 3 |  |
Plan Assets |  |
Balance at beginning of period | 533 | 518
Foreign currency translation | 16 | (24)
Asset returns – assets held at reporting date | (3) | (38)
Asset returns – assets sold during the period | 30 | 63
Purchases, sales and settlements, net | (112) | (50)
Asset transfers during the period |  | 64
Balance at end of period | 464 | 533
Level 3 | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 113 | 189
Foreign currency translation | 4 | (11)
Asset returns – assets held at reporting date | (6) | (18)
Asset returns – assets sold during the period | 7 | 20
Purchases, sales and settlements, net | (75) | (67)
Asset transfers during the period |  | 0
Balance at end of period | 43 | 113
Level 3 | Private equity |  |
Plan Assets |  |
Balance at beginning of period | 103 | 147
Foreign currency translation | 4 | (8)
Asset returns – assets held at reporting date | (22) | (11)
Asset returns – assets sold during the period | 17 | 28
Purchases, sales and settlements, net | (27) | (53)
Asset transfers during the period |  | 0
Balance at end of period | 75 | 103
Level 3 | Real estate |  |
Plan Assets |  |
Balance at beginning of period | 317 | 182
Foreign currency translation | 8 | (5)
Asset returns – assets held at reporting date | 25 | (9)
Asset returns – assets sold during the period | 6 | 15
Purchases, sales and settlements, net | (10) | 70
Asset transfers during the period |  | 64
Balance at end of period | 346 | 317
Pension Plan | Level 1 |  |
Plan Assets |  |
Balance at beginning of period | 978 |
Balance at end of period | 1,041 | 978
Pension Plan | Level 1 | Cash and cash equivalents |  |
Plan Assets |  |
Balance at beginning of period | 259 |
Balance at end of period | 213 | 259
Pension Plan | Level 1 | Global large cap equity |  |
Plan Assets |  |
Balance at beginning of period | 27 |
Balance at end of period | 7 | 27
Pension Plan | Level 1 | U.S. large cap equity |  |
Plan Assets |  |
Balance at beginning of period | 69 |
Balance at end of period | 159 | 69
Pension Plan | Level 1 | U.S. mid/small cap equity |  |
Plan Assets |  |
Balance at beginning of period | 198 |
Balance at end of period | 245 | 198
Pension Plan | Level 1 | Mutual funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 133 |
Balance at end of period | 144 | 133
Pension Plan | Level 1 | Mutual funds – U.S. equity |  |
Plan Assets |  |
Balance at beginning of period | 188 |
Balance at end of period | 206 | 188
Pension Plan | Level 1 | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 104 |
Balance at end of period | 67 | 104
Pension Plan | Level 2 |  |
Plan Assets |  |
Balance at beginning of period | 2,190 |
Balance at end of period | 2,459 | 2,190
Pension Plan | Level 2 | Structured debt |  |
Plan Assets |  |
Balance at beginning of period | 699 |
Balance at end of period | 811 | 699
Pension Plan | Level 2 | Corporate debt securities |  |
Plan Assets |  |
Balance at beginning of period | 261 |
Balance at end of period | 384 | 261
Pension Plan | Level 2 | Asset backed securities |  |
Plan Assets |  |
Balance at beginning of period | 2 |
Balance at end of period | 2 | 2
Pension Plan | Level 2 | Investment funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 268 |
Balance at end of period | 297 | 268
Pension Plan | Level 2 | Investment Funds Emerging Markets [Member] |  |
Plan Assets |  |
Balance at end of period | 33 |
Pension Plan | Level 2 | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 411 |
Balance at end of period | 373 | 411
Pension Plan | Level 2 | Government issued debt securities |  |
Plan Assets |  |
Balance at beginning of period | 341 |
Balance at end of period | 260 | 341
Pension Plan | Level 2 | Insurance contracts |  |
Plan Assets |  |
Balance at beginning of period | 105 |
Balance at end of period | 105 | 105
Pension Plan | Level 2 | Derivatives |  |
Plan Assets |  |
Balance at beginning of period | 103 |
Balance at end of period | 194 | 103
Pension Plan | Fair Value Measured at Net Asset Value Per Share |  |
Plan Assets |  |
Balance at beginning of period | 569 |
Balance at end of period | 640 | 569
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 57 |
Balance at end of period | 96 | 57
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment Funds Emerging Markets [Member] |  |
Plan Assets |  |
Balance at beginning of period | 20 |
Balance at end of period | 23 | 20
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 282 |
Balance at end of period | 328 | 282
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 210 |
Balance at end of period | 193 | 210
Pension Plan | Level 3 |  |
Plan Assets |  |
Balance at beginning of period | 533 |
Balance at end of period | 464 | 533
Pension Plan | Level 3 | Investment funds – real estate |  |
Plan Assets |  |
Balance at beginning of period | 290 |
Balance at end of period | 316 | 290
Pension Plan | Level 3 | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 113 |
Balance at end of period | 43 | 113
Pension Plan | Level 3 | Private equity |  |
Plan Assets |  |
Balance at beginning of period | 103 |
Balance at end of period | 75 | 103
Pension Plan | Level 3 | Real estate – direct |  |
Plan Assets |  |
Balance at beginning of period | 27 |
Balance at end of period | 30 | 27
Pension Plan | Total assets in fair value hierarchy |  |
Plan Assets |  |
Balance at beginning of period | 3,701 |
Balance at end of period | 3,964 | 3,701
U.S. Plans | Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accrued income | 1 | 1
Plan Assets |  |
Balance at beginning of period | 1,012 | 1,220
Foreign currency translation | 0 | 0
Balance at end of period |  | 1,012
U.S. Plans | Pension Plan | Level 1 |  |
Plan Assets |  |
Balance at beginning of period | 707 |
Balance at end of period | 813 | 707
U.S. Plans | Pension Plan | Level 1 | Cash and cash equivalents |  |
Plan Assets |  |
Balance at beginning of period | 34 |
Balance at end of period | 23 | 34
U.S. Plans | Pension Plan | Level 1 | Global large cap equity |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 1 | U.S. large cap equity |  |
Plan Assets |  |
Balance at beginning of period | 66 |
Balance at end of period | 155 | 66
U.S. Plans | Pension Plan | Level 1 | U.S. mid/small cap equity |  |
Plan Assets |  |
Balance at beginning of period | 182 |
Balance at end of period | 218 | 182
U.S. Plans | Pension Plan | Level 1 | Mutual funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 133 |
Balance at end of period | 144 | 133
U.S. Plans | Pension Plan | Level 1 | Mutual funds – U.S. equity |  |
Plan Assets |  |
Balance at beginning of period | 188 |
Balance at end of period | 206 | 188
U.S. Plans | Pension Plan | Level 1 | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 104 |
Balance at end of period | 67 | 104
U.S. Plans | Pension Plan | Level 2 |  |
Plan Assets |  |
Balance at beginning of period | 49 |
Balance at end of period | 52 | 49
U.S. Plans | Pension Plan | Level 2 | Structured debt |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 2 | Corporate debt securities |  |
Plan Assets |  |
Balance at beginning of period | 49 |
Balance at end of period | 52 | 49
U.S. Plans | Pension Plan | Level 2 | Asset backed securities |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 2 | Investment funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 2 | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 2 | Government issued debt securities |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 2 | Insurance contracts |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 2 | Derivatives |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share |  |
Plan Assets |  |
Balance at beginning of period | 132 |
Balance at end of period | 143 | 132
U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 14 |
Balance at end of period | 18 | 14
U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment Funds Emerging Markets [Member] |  |
Plan Assets |  |
Balance at beginning of period | 20 |
Balance at end of period | 23 | 20
U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 98 |
Balance at end of period | 102 | 98
U.S. Plans | Pension Plan | Level 3 |  |
Plan Assets |  |
Balance at beginning of period | 123 |
Balance at end of period | 122 | 123
U.S. Plans | Pension Plan | Level 3 | Investment funds – real estate |  |
Plan Assets |  |
Balance at beginning of period | 94 |
Balance at end of period | 96 | 94
U.S. Plans | Pension Plan | Level 3 | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 0 |
Balance at end of period | 0 | 0
U.S. Plans | Pension Plan | Level 3 | Private equity |  |
Plan Assets |  |
Balance at beginning of period | 9 |
Balance at end of period | 5 | 9
U.S. Plans | Pension Plan | Level 3 | Real estate – direct |  |
Plan Assets |  |
Balance at beginning of period | 20 |
Balance at end of period | 21 | 20
U.S. Plans | Pension Plan | Total assets in fair value hierarchy |  |
Plan Assets |  |
Balance at beginning of period | 879 |
Balance at end of period | $ 987 | $ 879

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