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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