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Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Net current period other comprehensive income (loss) $ 53 $ (215)    
Net current period other comprehensive income (loss) 11 18    
Total Other Comprehensive Income (Loss), Net of Tax 55 (161)    
Accumulated Other Comprehensive Income (loss)     $ (3,239)  
Defined Benefit Pension Plans        
Defined benefit and other postretirement benefit plans - Beginning balance (803) (912)    
Other comprehensive income/(loss) before reclassifications 7 0    
(Income)/loss reclassified from AOCI [1] 6 14    
Net current period other comprehensive income (loss) 13 14    
Defined benefit and other postretirement benefit plans - Ending balance (790) (898)    
Other Postretirement Benefit Plans        
Defined benefit and other postretirement benefit plans - Beginning balance (34) (40)    
Other comprehensive income/(loss) before reclassifications (2) 2    
(Income)/loss reclassified from AOCI [1] 0 0    
Net current period other comprehensive income (loss) (2) 2    
Defined benefit and other postretirement benefit plans - Ending balance (36) (38)    
Unrealized Translation        
Unrealized translation - Beginning balance (2,422) (2,157)    
Other comprehensive income/(loss) before reclassifications 57 (205)    
(Income)/loss reclassified from AOCI 0 0    
Net current period other comprehensive income (loss) 57 (205)    
Unrealized translation - Ending balance (2,365) (2,362)    
Cash Flow Hedges and Other        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (2) 22    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (7) 12    
Total Other Comprehensive Income (Loss), Net of Tax (9) 34    
Accumulated Other Comprehensive Income (loss) $ 11 $ (29) $ 20 $ (63)
[1] Included in computation of net periodic benefit costs.