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Shareholders' Equity - Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 7,298 $ 6,454
Amounts reclassified from accumulated other comprehensive loss 1 1
Net other comprehensive income 1 1
Ending balance 7,460 6,583
Employee Benefit Plan Funded Status    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (107) (106)
Amounts reclassified from accumulated other comprehensive loss 0 0
Net other comprehensive income 0 0
Ending balance (107) (106)
Amortization of Prior Service Cost    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1 1
Amounts reclassified from accumulated other comprehensive loss 0 0
Net other comprehensive income 0 0
Ending balance 1 1
Amortization of Actuarial Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 67 63
Amounts reclassified from accumulated other comprehensive loss 1 1
Net other comprehensive income 1 1
Ending balance 68 64
Loss on Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (6) (7)
Amounts reclassified from accumulated other comprehensive loss 0 0
Net other comprehensive income 0 0
Ending balance (6) (7)
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (45) (49)
Net other comprehensive income 1 1
Ending balance $ (44) $ (48)