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Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Net current period other comprehensive income (loss) $ (151) $ 38 $ (288) $ (236)    
Net current period other comprehensive income (loss) 16 0 45 39    
Total Other Comprehensive Income (Loss), Net of Tax (100) 35 (150) (192)    
Accumulated Other Comprehensive Income (loss) (3,305)   (3,305)   $ (3,172)  
Defined Benefit Pension Plans            
Defined benefit and other postretirement benefit plans - Beginning balance     (912) (979)    
Other comprehensive income/(loss) before reclassifications     5 (19)    
(Income)/loss reclassified from AOCI [1]     52 57    
Net current period other comprehensive income (loss)     57 38    
Defined benefit and other postretirement benefit plans - Ending balance (855) (941) (855) (941)    
Other Postretirement Benefit Plans            
Defined benefit and other postretirement benefit plans - Beginning balance     (40) (13)    
Other comprehensive income/(loss) before reclassifications     (12) 3    
(Income)/loss reclassified from AOCI [1]     (3) (1)    
Net current period other comprehensive income (loss)     (15) 2    
Defined benefit and other postretirement benefit plans - Ending balance (55) (11) (55) (11)    
Unrealized Translation            
Unrealized translation - Beginning balance     (2,157) (2,271)    
Other comprehensive income/(loss) before reclassifications     (266) (233)    
(Income)/loss reclassified from AOCI     0 0    
Net current period other comprehensive income (loss)     (266) (233)    
Unrealized translation - Ending balance (2,423) (2,504) (2,423) (2,504)    
Cash Flow Hedges and Other            
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     56 15    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     35 (10)    
Total Other Comprehensive Income (Loss), Net of Tax     91 5    
Accumulated Other Comprehensive Income (loss) $ 28 $ (26) $ 28 $ (26) $ (63) $ (31)
[1] Included in computation of net periodic benefit costs.